Sexual Responses Humans do not have a mating season , females are sexually receptive to the male at all times of the year. There are four stages in mating: arousal, plateau, orgasm, and resolution.During male arousal, blood flows into the three shafts of spongy erectile tissue inside the penis, causing it to become elongated and erect. The female arousal has the swelling of the areas around the vagina, erection of the clitoris and nipples, and secretion of lubricating fluids in the vagina.After insertion of the penis into the vagina, pelvic thrusts by both partners stimulate sensory receptors in the penis, vaginal walls, and clitoris. The sperm leave the epididymis and secretions of glands form the semen. Orgasm involves contractions of muscles of the penis (male) or vagina (female) and waves of pleasurable sensations.Resolution reverses the previous phases: muscles relax, breathing slows, the penis returns to its normal size.
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Sexual intercourse, Sexual arousal, Clitoris, Vagina