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Humans are born with 46 chromosomes in 23 pairs. Most women are 46XX and most men are 46XY. Research suggests, however, that in a few births per thousand some individuals will be born with a single sex chromosome 45X or 45Y sex monosomies and some with three or more sex chromosomes 47XXX, 47XYY or 47XXY, etc.

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T he female orgasm might have evolved as part of a biological mechanism to induce ovulation, according to findings published yesterday September 30 in PNAS. The study shows that female rabbits treated with antidepressants that suppress orgasms in humans release fewer eggs than normal during sex, pointing to a possible evolutionary explanation for where the phenomenon came from. The researchers treated 12 female rabbits with a two-week course of fluoxetine best known by the market name Prozacwhich is known to suppress orgasms in human women.

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This chapter provides an introduction to and brief overview of empirical and theoretical work on sexual conflict in humans, some of which is showcased in the current volume. We begin the chapter with a brief review of evolution by natural selection. We then discuss the application of evolutionary principles to psychology, with a focus on human psychology.

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We thought we were the only species to enjoy intimate interactions, but as Jason G Goldman discovers, a few curious couplings in nature have changed our view. Sex, we are told, is pleasurable. That's because most scientific accounts of sexual behaviour rest upon evolutionary explanations rather than the more immediately relevant mental and emotional experiences. To say that we have sex because it helps us to preserve our genetic legacies would be entirely accurate, but the more fleeting, experiential, pleasurable aspects of that most basic of social urges would be missing.

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The images below illustrate the male and female body parts that are involved in sexual activity and reproduction. These body parts are also commonly referred to as genitals, reproductive organs, or sex organs. The male body has sexual organs both inside and outside the body.

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Sexual intercoursealso called coitusor copulationreproductive act in which the male reproductive organ in humans and other higher animals enters the female reproductive tract. If the reproductive act is complete, sperm cells are passed from the male body into the female, in the process fertilizing the female egg and forming a new organism. In some vertebrates, such as fisheggs are laid outside of the body and fertilized externally.

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Archives of Sexual Behavior. Historically, the reasons people have sex have been assumed to be few in number and simple in nature—to reproduce, to experience pleasure, or to relieve sexual tension. Several theoretical perspectives suggest that motives for engaging in sexual intercourse may be larger in number and psychologically complex in nature.

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Verified by Psychology Today. Sex Matters. Sexuality evokes really strong opinions and most people have very definite preferences for what turns them on and what turns them completely off.

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Human sexuality is 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 also affects and is affected by cultural, political, legal, philosophical, moralethicaland religious aspects of life.

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Sex in the sense of "having sex". Don't confuse with Gender. From Wikimedia Commons, the free media repository. Please note that low-quality images with no realistic educational use nor a purpose within the Wikimedia projects may be deleted.

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