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The main difference between good genes and the sexy son hypothesis is that the latter assumes an indirect effect due to the attractiveness of the sons, whereas good genes focus on the viability of both sons and daughters.

However, "attractiveness" is not narrowly defined, and can refer to every trait that increases a male's probability to become polygynous.

Good-sperm models predict positive genetic associations between a male's sperm competitiveness and the general viability of his offspring, [7] whereas sexy-sperm models predict that multiple-mating females produce more grandchildren.

The sexy son hypothesis has also been put forward as the origin of some aspects of human sexual activity. In particular, research on the ovulatory shift hypothesis has shown that during the most fertile times of their menstrual cycles , human females are more attracted to more masculine and physically attractive men, and to men whose physical features are indicative of a higher exposure to testosterone during key developmental periods.

However, the methodology of these claims is disputed. From Wikipedia, the free encyclopedia. Postulate in biology.

This section needs expansion. You can help by adding to it. June The American Naturalist. Behavioral Ecology and Sociobiology. Sexual Selection.

The Mating Mind. Anchor Books, a division of Random House, Inc. First Anchor Books Edition, April New York, NY. Trends Ecol Evol.

Trends Ecol. The evolution of avian breeding systems. New York: Oxford University Press. Mate choice for offspring performance: major benefits or minor costs?

Behavioral Ecology. American Naturalist. Why do females mate with multiple males? The sexually selected sperm hypothesis.

Advances in the Study of Behavior. S; Perrett, D. I Evolution and Human Behavior. BBC News Online. Retrieved Categories : Sexual selection Evolutionary psychology Evolutionary biology.

Hidden categories: Articles with short description Short description matches Wikidata Articles to be expanded from June All articles to be expanded Articles using small message boxes.

Namespaces Article Talk. Bonobos, chimpanzees and dolphins are species known to engage in heterosexual behaviors even when the female is not in estrus, which is a point in her reproductive cycle suitable for successful impregnation.

These species are also known to engage in same-sex sexual behaviors. Sexual intercourse. This article is primarily about humans.

For other animals, see Animal sexual behaviour. For other uses, see Sex disambiguation. For copulation among other animals, see Copulation zoology.

See also: Human sexual activity and Human sexuality. Main articles: Sexual reproduction and Human reproduction.

See also: Coitus interruptus. See also: Intravaginal ejaculation latency time and Coitus reservatus. Main article: Sexuality and disability.

See also: Human mating strategies and Pair bond. Main article: Adolescent sexuality. See also: Sexual ethics , Religion and sexuality , and Sex and the law.

See also: Religion and sexuality. Main articles: Copulation zoology and Animal sexual behaviour. See also: Sexual coercion.

Human sexuality portal. See, for example; "Sexual intercourse". Retrieved November 22, Retrieved December 5, Retrieved May 9, Richard M.

Lerner ; Laurence Steinberg Handbook of Adolescent Psychology. Retrieved April 29, Encyclopedia of Sex and Gender: A-C.

Macmillan Reference. This 'coming together' is generally understood in heteronormative terms as the penetration of a woman's vagina by a man's penis.

Irving B. Weiner; W. Edward Craighead The Corsini Encyclopedia of Psychology. Retrieved August 21, Human sexual intercourse, or coitus, is one of the most common sexual outlets among adults.

Sexual intercourse generally refers to penile penetration of the vagina. Clint E. Bruess; Elizabeth Schroeder Sexuality Education Theory and Practice.

In many cultures around the world, vaginal sex is what is usually implied when people refer to 'having sex' or 'sexual intercourse. Cecie Starr; Beverly McMillan Human Biology.

Cengage Learning. Retrieved December 27, Coitus and copulation are both technical terms for sexual intercourse. The male sex act involves an erection, in which the limp penis stiffens and lengthens.

It also involves ejaculation, the forceful expulsion of semen into the urethra and out from the penis. The stimulation triggers rhythmic, involuntary contractions in smooth muscle in the male reproductive tract, especially the vas deferens and the prostate.

The contractions rapidly force sperm out of each epididymis. They also force the contents of seminal vesicles and the prostate gland into the urethra.

The resulting mixture, semen, is ejaculated into the vagina. Janell L. Carroll Sexuality Now: Embracing Diversity. Vaginal intercourse also referred to as sexual intercourse involves inserting the penis into the vagina.

Essential Concepts for Healthy Living. Most heterosexuals are familiar with the notion of 'having sex' or sexual intercourse as vaginal sex, the insertion of a penis into a vagina.

Vaginal sex, or coitus, is the most common and popular form of intimate sexual activity between partners. Archived from the original on August 22, Retrieved January 12, Human Sexuality in a World of Diversity.

Discovering Biological Psychology. World Health Organization. January Retrieved September 5, In English, the term 'sex' is often used to mean 'sexual activity' and can cover a range of behaviours.

Other languages and cultures use different terms, with slightly different meanings. Nancy W. Denney; David Quadagno Human Sexuality. Mosby-Year Book.

Although the term intercourse is usually used to refer to the insertion of the penis into the vagina, it is also used to refer to oral intercourse or anal intercourse in which the penis is inserted into the mouth or the anus, respectively.

Dianne Hales Brief Edition 3rd ed. The Encyclopedia of Mental Health. Infobase Publishing. An Invitation to Health Brief — Sexually Transmitted Infections.

Elsevier Health Sciences. Carpenter LM NYU Press. Retrieved October 8, Most people agree that we maintain virginity as long as we refrain from sexual vaginal intercourse.

But occasionally we hear people speak of 'technical virginity' [ Advanced biology. Oxford University Press. Retrieved October 21, Pearson Education India.

Petri, John M. Govern Motivation: Theory, Research, and Application. Trends Ecol. Palgrave Macmillan. Fedwa Malti-Douglas Ada P.

Kahn; Jan Fawcett Carroll JL Discovery Series: Human Sexuality 1st ed. Health and Wellness for Life.

Human Kinetics. Retrieved September 6, Retrieved August 23, Retrieved August 24, The widespread, unquestioned equation of penile—vaginal intercourse with sex reflects a failure to examine systematically 'whether the respondent's understanding of the question matches what the researcher had in mind.

Laura M. Carpenter In many cultures around the world, vaginal sex is what is usually implied when people refer to 'having sex' or 'sexual intercourse'.

It is the most frequently studied behavior and is often the focus of sexuality education programming for youth.

Retrieved March 30, Retrieved December 26, Concise Medical Dictionary. Retrieved July 4, Journal of Pediatric and Adolescent Gynecology.

Harvey B. Milkman; Kenneth W. Wanberg Retrieved October 9, Cohen But occasionally we hear people speak of 'technical virginity' Data indicate that 'a very significant proportion of teens ha[ve] had experience with oral sex, even if they haven't had sexual intercourse, and may think of themselves as virgins'.

Robert Crooks; Karla Baur Our Sexuality. Noncoital forms of sexual intimacy, which have been called outercourse, can be a viable form of birth control.

Outercourse includes all avenues of sexual intimacy other than penile—vaginal intercourse, including kissing, touching, mutual masturbation, and oral and anal sex.

UD, TK Like a Virgin. The Advocate. Here Publishing. Retrieved March 13, Retrieved February 12, Exploring the Dimensions of Human Sexuality.

McAnulty; M. Michele Burnette Andrew Baum; Tracey A. Revenson; Jerome Singer Handbook of Health Psychology 2nd ed. Psychology Press. Having started with a discussion of penile-vaginal intercourse as the act that designates sexual initiation, as defined in most studies, we would like to undercut that position by stressing the need to define sex more broadly.

Retrieved April 30, Gender Power and Communication in Human Relationships. June Archived from the original PDF on May 10, Retrieved August 30, The Epidemic: A History of Aids.

Many men simply did not like the feel of condoms, or associated them with emasculation. They say, 'Unless it's flesh on flesh, it's not real sex Wekwete African Books Collective.

Lloyd; Dana S. Dunn; Elizabeth Yost Hammer Retrieved January 5, The man-above, or "missionary," position is the most common [sex position]. The Big Book of Sex Toys.

Retrieved June 9, Essential Concepts for Healthy Living Update. Retrieved December 9, Knobil and Neill's Physiology of Reproduction.

Reis; Susan Sprecher; Susan K. Sprecher Encyclopedia of Human Relationships. Oxford University Press, 2nd edition. Neurobiology of Chemical Communication.

Lotus Press. Retrieved August 17, Janicak A Lange clinical manual. Clinical Psychology Review. Obstetrics and Gynecology Clinics of North America.

Most women report the inability to achieve orgasm with vaginal intercourse and require direct clitoral stimulation The case of the female orgasm: bias in the science of evolution.

Harvard University Press. The Journal of Urology. The Orgasm Answer Guide. JHU Press. Retrieved November 6, New York University Press.

Retrieved March 2, Retrieved June 23, Human Reproduction. Human Reproductive Biology. Academic Press. Retrieved November 8, Taking Charge of Your Fertility Revised ed.

New York: HarperCollins. Mayo Clinic. November 2, Retrieved February 16, National Institute for Health and Care Excellence.

Published date: February Philip B. American Pregnancy Association. The Handy Anatomy Answer Book. Visible Ink Press. Sharma Elsevier India.

Retrieved October 13, O'Toole Mosby's Medical Dictionary. Journal of Marriage and Family. Burda Gay, lesbian, and transgender clients: a lawyer's guide.

American Bar Association. Retrieved July 28, Durham; Felissa R. Lashley Springer Publishing Company. Retrieved January 29, Current Opinion in Obstetrics and Gynecology.

Murray Sex and the American teenager seeing through the myths and confronting the issues. Lanham, Md. American Journal of Preventive Medicine.

Hyatt Dulles Airport, Herndon, Virginia. Archived from the original PDF on March 7, Retrieved March 20, Archived from the original on May 9, Retrieved July 23, Sexually Transmitted Infections E book.

An Invitation to Health: Choosing to Change. The Journal of Sexual Medicine. Retrieved March 4, World comparisons and recent trends" PDF. Population and Societies.

Archived from the original PDF on March 4, Retrieved February 9, Richard Jennings; Maria M. Susman Handbook of Behavioral Medicine: Methods and Applications.

Retrieved December 7, Biology of Women. Life-Span Human Development. Principles and Labs for Fitness and Wellness. February 22, Retrieved December 8, This article incorporates text from this source, which is in the public domain.

Medical microbiology 7th ed. Louis, MO: Mosby. Archived from the original on December 1, Mims' medical microbiology 5th ed.

Edinburgh: Saunders. Centers for Disease Control and Prevention. Retrieved September 15, Retrieved June 20, July 18, July Retrieved September 8, Retrieved December 6, Guttmacher Institute.

Archived from the original on December 23, November 16, Journal of Psychoactive Drugs. Current Neurology and Neuroscience Reports. Nature and Science of Sleep.

Serruys; Jeff Moses Textbook of Interventional Cardiovascular Pharmacology. CRC Press. March 23, Systematic Review and Meta-analysis".

Acute cardiac events were significantly associated with episodic physical and sexual activity; this association was attenuated among persons with high levels of habitual physical activity.

Standard Practice in Sexual Medicine. Retrieved October 22, Jannini; Chris G. McMahon; Marcel D. Waldinger Reinisch; Ruth Beasley Human Sexuality: An Encyclopedia.

Human Sexuality: From Cells to Society. Weiner; George Stricker; Thomas A. Widiger Handbook of Psychology, Clinical Psychology.

Introduction to Psychology. Inhibited female orgasm refers to a persistent delay or absence of orgasm after becoming aroused and excited.

Ferri Retrieved November 29, Goldman; Rebecca Troisi; Kathryn M. Rexrode Women and Health.

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