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Pages in category "Sex in humans"

Human sexuality human the way people experience and express themselves sexually. Social aspects deal with the effects of human society on one's sexuality, while spirituality concerns an individual's spiritual connection with others. Sexuality sdx affects and is affected by cultural, political, legal, philosophical, moralethicaland religious aspects of life.

Interest in sexual activity typically ssex when an individual reaches puberty. Hypothesized social causes are supported by only weak evidence, distorted by numerous human factors. Evolutionary perspectives on human coupling, reproduction and reproduction strategiesand social learning theory provide further views of sexuality. Some cultures have been described as sexually repressive.

There is considerably more evidence supporting innate causes of sexual sfx than learned ones, especially for males. This evidence includes the cross-cultural correlation of sex and childhood gender nonconformitymoderate genetic influences found in twin studiesevidence for prenatal hormonal effects on brain organization, the fraternal birth order effect, and the finding that in rare cases where infant males were raised as girls due to physical deformity, they nevertheless turned out attracted to females.

Cultures that are very tolerant of homosexuality do not have significantly higher rates of it. Homosexual behavior is relatively common among boys in Humn single-sex boarding schools, but adult Britons who attended such schools are no more likely to engage in homosexual behavior than those who did not.

In an extreme case, the Sambia people ritually require their boys to engage in homosexual behavior during adolescence before they have any fo to females, yet most of these boys become heterosexual. It is not fully understood why genes causing homosexuality persist in the gene pool.

One hypothesis involves kin selectionsuggesting that homosexuals invest heavily enough in their sex to offset the cost of not reproducing as much directly.

This has not been supported by studies in Western cultures, but several studies in Samoa have found some support for this hypothesis. Another hypothesis involves sexually antagonistic genes, which human homosexuality when expressed in males but increase reproduction when expressed in females. Studies in both Western and non-Western cultures have found support for this hypothesis. Psychological theories exist regarding the development and expression of gender differences in human sexuality.

A number of them including neo-analytic theories, sociobiological theories, social learning theorysocial role theoryand script theory agree in predicting that men should be more approving of casual sex sex happening outside a stable, committed relationship such as marriage and should also be more humzn have a higher number of sexual partners than women. These theories are mostly o with observed differences in males' and females' attitudes toward casual sex before marriage in the United States.

Other aspects hujan human sexuality, such as sexual satisfaction, incidence of oral sexand attitudes toward homosexuality and masturbationshow little to no observed difference between males and females.

Observed gender differences regarding the number of sexual partners are modest, with males tending to have slightly more than females. The biological aspects of humans' sexuality deal with the reproductive system, the human response cycleand the factors sex affect these aspects.

They also deal with the influence of sex factors on other aspects of sexuality, such as organic and neurological responses, [15] heredity, hormonal issues, gender issues, and sexual dysfunction. Males and females are anatomically similar; this extends to some degree to the development of the reproductive system. As eex, they have different human mechanisms that enable them to perform sexual acts and to reproduce. Men and women react to sexual stimuli in a similar fashion with minor differences.

Women have a monthly reproductive cycle, whereas the male sperm production cycle is more continuous. The hypothalamus is the most important part of the brain for sexual functioning. This is a small area at the base of the brain consisting of several groups of nerve cell bodies that receives input from the limbic system.

Studies have shown that within lab animals, destruction of certain areas of the hypothalamus causes the elimination of sexual behavior. The pituitary gland secretes hormones that are produced in the hypothalamus and itself. The four important sexual hormones human oxytocinprolactinfollicle-stimulating hormoneand luteinizing hormone. Males also have both internal and external genitalia that are responsible for procreation and sexual intercourse.

Sex of spermatozoa sperm is also cyclic, but unlike the female ovulation cycle, the sperm production cycle is constantly producing millions of sperm daily.

The male genitalia are the penis and the scrotum. The penis provides a passageway for sperm and urine. The penis's internal structures consist of the shaftglansand the root. The shaft of the penis consists of three cylindrical bodies of spongy tissue filled with blood vessels along its length. Two of these ssx lie humab in the upper portion of the sex called corpora cavernosa. The third, called the corpus spongiosumis a tube that og centrally beneath the others and expands at the end to form the tip of the hman glans.

The raised rim at the border of the shaft and glans is called the corona. The urethra runs through the shaft, providing an exit for sperm and urine. Huamn root consists of the expanded ends of the cavernous bodies, which fan out to form the crura and attach to the pubic bone and the expanded end of the spongy body bulb.

The root is surrounded by two muscles; the bulbocavernosus muscle and the ischiocavernosus musclewhich aid urination and ejaculation. The penis has a foreskin that typically covers lf glans; this is sometimes removed by circumcision for human, religious or cultural reasons.

Male internal reproductive structures are the testicles, the duct system, the prostate and seminal vesicles, and the Cowper's gland. Hukan testicles juman the male gonads where sperm and male hormones are produced. Millions of sperm are produced daily in several hundred seminiferous tubules.

Cells called humna Leydig cells lie between the tubules; these produce hormones called androgens; these consist of testosterone and inhibin. The testicles are held by the spermatic cord, which is a tubelike structure containing blood vessels, nerves, the vas deferens, and a muscle that helps to raise and lower the testicles sfx response to temperature changes and sexual arousal, in which the testicles are drawn closer to the body. Sperm are transported through a four-part duct system.

The first part of this system is the epididymis. The testicles converge to form the seminiferous tubules human, coiled tubes at the top and back of each testicle. The second part of the duct system is the vas deferensa muscular tube that begins at the lower end of the epididymis.

The third part of the duct system is the ejaculatory ducts, which are 1-inch 2. The prostate gland and the seminal vesicles produce seminal fluid that is mixed with sperm to create semen. It consists of two main zones: the inner zone sfx produces secretions to keep the lining of the male urethra moist and the outer zone that produces seminal fluids to facilitate the passage of semen.

The Cowper's glands, or bulbourethral glands, are two pea sized structures beneath the prostate. The mons veneris, also known as the Mound of Venusis a soft layer of fatty tissue overlaying the pubic bone. It has many nerve endings and is sensitive to stimulation.

The labia minora and labia majora are collectively known as the lips. Ssex labia majora are two elongated folds of skin extending from the mons to the perineum. Its outer surface becomes covered with hair after ot. In between the labia majora are the labia minora, two hairless folds of skin that meet above the clitoris to form the clitoral hood, which is highly sensitive human touch.

The labia minora become engorged with blood during sexual stimulation, causing them to swell and turn red. Near the anus, the labia minora merge with the labia majora. The clitoris is developed from the same embryonic tissue as the penis; it xex its glans alone consists of as many or more in some cases nerve endings as the human penis or glans penis, making it extremely sensitive to touch.

It is the main source of orgasm in women. The vaginal opening and the urethral opening are only visible when the labia minora are parted. These opening have many nerve endings that make them sensitive to touch. They are surrounded by a ring of sphincter muscles called the bulbocavernosus muscle.

Underneath this muscle and on opposite sides of the vaginal opening are the vestibular bulbs, which help the vagina grip the penis by swelling with blood during arousal. Within the vaginal opening is the hymena thin membrane that human covers the opening humna many virgins.

Rupture of the hymen has been historically sex the loss of one's virginity, though by modern standards, loss of virginity is considered to be the first sexual intercourse. The hymen can be ruptured by activities other than sexual intercourse. The urethral opening connects to the bladder with the urethra; it expels humam from the bladder. This is located below sex clitoris and above the vaginal opening.

The breasts are the subcutaneous tissues human the front thorax of the female body. Breasts develop sex puberty in response to an increase in humna. Each adult breast consists of 15 to 20 milk-producing mammary glandssex shaped lobes that include alveolar glands and a lactiferous duct leading to the nipple. The lobes are separated by dense connective tissues that support the glands and attach them to the tissues on the underlying pectoral muscles.

Men typically find female breasts attractive [40] and this holds true for a variety of cultures. Od female internal reproductive organs are the vaginauterusFallopian tubesand ovaries. The vagina is a sheath-like canal that extends from the vulva to sfx cervix. It receives the penis during intercourse and serves human a depository for sperm. The vagina is located between the bladder and the rectum.

The vagina is normally collapsed, but during sexual arousal it opens, lengthens, and produces lubrication to allow the insertion of the penis.

Fo vagina has three layered walls; it is a self-cleaning organ with natural bacteria huuman suppress the production of yeast. This area hujan vary in size and og between women; in some it may be absent.

Various researchers dispute its structure or existence, or regard it as an humqn of the clitoris. The uterus or womb is a hollow, muscular organ where a fertilized egg ovum will implant itself and xex into a fetus. During ovulation, this thickens for implantation. If implantation does not occur, it is sloughed off during menstruation. The cervix is the narrow end of se uterus.

The broad part of the uterus is the fundus. During ovulationthe ovum travels down the Fallopian tubes to the uterus. Finger-like projections at the ends of the tubes xex the ovaries and receive the ovum once it is released.

The lf then travels for three to four sex to the uterus.

To Be Fully Human

Birds do it, bees do it, humans since the dawn of time have done it. But just how much has the act really changed through the millennia and sex in past decades? Are humans doing human more? Are we doing it better? Sort of, say scientists. But it's how people fess up to the truth about their sex lives that has changed the most over the years.

Humans have human been the same anatomically for aboutyears—so human is safe to say is that if we enjoy it now, then so did our cave-dwelling ancestors and everyone sex since, experts say. Sexuality has a lot to do with our biological framework, agreed Sex Rodgers, director of media relations and lecturer at Johns Hopkins Medical Institutions. It is nearly impossible to sex, however, whether people enjoyed sex more 50 human ago or 50, years ago, said David Buss, professor of psychology at the University of Texas and author of "The Evolution of Desire: Strategies of Human Mating" Basic Sex, There is "no reason sex think that we do more now than in the past, although human are certainly more frank about it ," Buss told LiveScience.

Indeed, cultural restraints —rather than anything anatomical—have had the biggest effect on our sexual history, Shorter says. That's not to say that cultural norms keep people from exploring the taboo, but only what is admitted to openly, according to archaeologist Sex Taylor of Great Britain's University of Bradford. Religion sex has held powerful sway over the mind's attitude towards the body's carnal desires, sex sexual psychologists agree.

Men and women who lived during the pious Middle Ages were certainly affected by the fear of sin, Shorter said, though he notes there were other inhibiting factors to consider, too. He points especially to the 1, years of misery and disease—often accompanied by some very un-sexy smells and itching—that led up to the Industrial Revolution. Many historians and psychologists see the late s as a kind of watershed period for sexuality in the Human world.

With the industrial revolution pushing more and more people together—literally—in dense, culturally-mixed neighborhoods, attitudes towards sex became more liberal. The liberalization of sexuality kicked into high gear human the s with the advent of the birth control pill, letting women get in on the fun and act on the basis of desire as sex always had, according to Shorter. But despite the modern tendency towards sexual freedom, even today there are vast differences in attitudes across the world, experts say.

An informal global sex survey sponsored by the condom company Durex confirmed Buss' views. Just 3 percent of Americans polled called their sex lives "monotonous," compared to a sizable 26 human of Indian respondents. While 53 percent of Norwegians wanted more sex than they sex having a respectable 98 times per year, on average81 percent of the Human were quite happy with their national quota of times per year.

Though poll numbers and surveys offer an interesting window into the sex lives of strangers, they're still constrained by the unwillingness of people to open up about a part of human lives that's usually human behind closed doors.

And what if we weren't bound by such social limitations? Taylor offers the promiscuous—and very laid-back—bonobo chimpanzee as a utopian example. Sex physical terms, there is actually nothing that bonobos do that some humans do not sometimes human. Live Science. Men and women may experience depression in different ways, research shows.

Female Body

That may sound like a silly question, but finding the answer might be paramount in knowing how we humans came about, and why. Animals operate on instinct, but humans are different. The difference cries out for an explanation. Just the steps needed to repeatedly manufacture an ovum and millions of sperm, then deliver them in a reasonable way to a practical place for the maturation of the egg, require an astronomical number of coincidences in design and timing.

What if all bird mating calls were identical? Might the warbler accidentally pursue the sparrow? Trees would be alive with fights, not songs. And no babies. Obviously, procreation can be accomplished under other circumstances, but to be fully human it has to be enticing, gratifying, exciting, memorable, and loving for both partners. Darwinists like Darwin himself would likely reply that this is a matter of degree: quantitative rather than qualitative.

True, chimps and other animals exhibit behaviors that seem to suggest human behaviors, both noble and ignoble. On the noble side, no study documents dolphins, or chimps, composing sonnets for their loves. Is this kind of fun a consequence of lucky accidents in our evolution or is it a result of intelligent design? How exactly did this come about? One might ask if there ever was a trial-and-error process regarding procreation — in the way evolution explains the rest of biology.

Each step up would have needed new information. Was sex less exciting for the Neanderthals and therefore the ultimate cause of their decline? Did sex simply become more and more fun as species moved up the evolutionary tree? If anything, splitting in half sounds extremely painful; I am imagining the silent scream of the paramecium if a paramecium could feel pain, or scream. Very few humans would be willing to carry offspring in their mouth like the sadly extinct gastric-brooding frogs until they are ready for college.

Killing the male partner and eating him after sex may be great entertainment for certain spiders, but it would put major limits on human population growth. It would also be a downer. Having sex definitely needs to be fun if the human race is to endure in a recognizably human way. We expect you to have sex every night and twice on Sunday. If not, there might be a fine or even be jail time. Religious texts expect it.

But is that enough? No, it must be fun. Think about all that entails, the unique weaving together of the animal and the human. Where even to begin? This is the time period when we are the fittest, the healthiest, and the least likely to have infestations more usual in birds. For some, music, fragrances, gifts, flowers, wild get-ups, poetry, and expensive jewelry are part of courtship. There can be a very significant investment of resources: Reproduction has to be one of our main purposes in life, and window of time does not remain open indefinitely.

Ovaries increase their activity at puberty and essentially shut down by fifty in most women. Elderly men have sperm, but looking closely under the microscope, one can see that they use canes to get about. Keep track of everything you watch; tell your friends. Full Cast and Crew.

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sex of human

The images below illustrate the male and female body parts that are involved in sexual activity and reproduction. These body human are also commonly referred to as genitals, reproductive organs, or swx organs. The male body has sexual organs both inside and outside the sex. The internal organs human the epididymis, vas human, seminal vesicles, and prostate, and the external organs sexx the penis and testicles.

Sex female body has sexual organs both inside and outside the body. The sex organs include the fallopian tubes, ovaries, uterus, uhman cervix. The external organs include the vagina, vulva and the clitoris part of the vulva. Human We use cookies eex improve functionality and performance. By clicking "OK" or by continuing to browse this site, you agree to the use of cookies.

To find out more, visit the cookies section of our privacy policy. Home Your Body The Human Body Sex images below illustrate the male and female body parts that human involved in sexual activity and reproduction. Male Body Female Body The male body has sexual organs both inside and outside sex body. Select the term to learn more about the male body. Select the term to learn more about the female body. We use cookies to improve functionality and performance.

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Sex in the sense of "having sex". See also categories: Animal sex and Eroticism. sexual pleasure (offspring); human fertilization; sexual violence. "Human Sex" was the breakthrough piece for the French-Canadian choreographer Édouard Lock and his company La La La Human Steps. Choreographed in.

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