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Physiology of sex

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Changes induced by human sexual arousal serve reproductive and recreational functions. The current sexual phase model desire, excitation, orgasm, and resolution conveys little about this duarchy. Lack of spontaneous sexual desire in a third of nonclinic females indicates that the D phase needs splitting into D1 the spontaneous endogenous activation of desire and D2 desire activated by sexual excitation at and during the E phase. Attempts to link D1 with reproduction by studies monitoring it over the menstrual cycle revealed a D1 peak just before or at ovulation, but its reliability is criticized because of the poor identification of the time of ovulation.
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The Physiology of Sexual Arousal in the Human Female: A Recreational and Procreational Synthesis

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The physiology of sexual arousal in the human female: a recreational and procreational synthesis

Coitus and conception are the initial stages that occur in humans that allow for the establishment of pregnancy. In order for coitus to occur humans need to be sexually aroused. Sexual arousal is then followed by a series of phases. These phases are:.
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Sexual intercourse

Changes induced by human sexual arousal serve reproductive and recreational functions. The current sexual phase model desire, excitation, orgasm, and resolution conveys little about this duarchy. Lack of spontaneous sexual desire in a third of nonclinic females indicates that the D phase needs splitting into D1 the spontaneous [endogenous] activation of desire and D2 desire activated by sexual excitation at and during the E phase. Attempts to link D1 with reproduction by studies monitoring it over the menstrual cycle revealed a D1 peak just before or at ovulation, but its reliability is criticized because of the poor identification of the time of ovulation. Sexual arousal initiates enhanced genital blood flow, leading to the formation of a neurogenic transudate, lubricating the vagina, partly buffering its acidity, and increasing its oxygen tension all features that enhance spermatozoal function and survival.
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Sexual intercourse , also called coitus or copulation , reproductive act in which the male reproductive organ in humans and other higher animals enters the female reproductive tract. In some vertebrates, such as fish , eggs are laid outside of the body and fertilized externally. To accomplish internal copulation, certain body and organic adaptations are necessary. In the human male, the penis serves both excretory and reproductive functions. During intercourse, the blood flow is temporarily increased and trapped in the penis so that it becomes enlarged and elevated, a condition known as erection.
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