Erect penis enters similarly blood-engorged vagina and ejects semen, four milliliters with 3 x 10^8 sperm, by epididymis, vas deferens, and urethra involuntary-muscle orgasm contractions {copulation} {intercourse}|. Only human females can have orgasms in clitoris and/or vagina and uterus. Sperm travel {motile} by tail movements and uterus contractions to oviduct tops. Sperm live 24 to 48 hours. Eggs live 24 to 78 hours.
sexual intercourse {coition}|.
sexual intercourse {coitus}|.
sexual intercourse {coupling}|.
Intercourse can cause pain {dyspareunia} in both men and women.
Fathers can have sexual intercourse with daughters, or mothers can have sexual intercourse with sons {incest}|.
Increased blood flow causes vasocongestion, which creates penis erections in males and vaginal lubrication {transudorific reaction, vagina} in females.
Glans penis or clitoris stimulation builds to muscle contractions {orgasm}|.
physiology
Men and women sexual physiologies are essentially the same. First, physical or psychological sexual stimulation causes more blood flow, as heart rate increases. Increased blood flow causes vasocongestion, which creates male penis erection and female vaginal lubrication {transudorific reaction, orgasm}. Then vagina lengthens and increases diameter, especially inner third. Penis increases diameter and length. Vasocongestion causes clitoris and breast nipples to become erect. Then involuntary muscular contractions trigger, causing male orgasm and seminal-fluid ejaculation. In males, glans penis has orgasm. In females, orgasm can be in clitoris and/or vagina.
female
Female sexual stimulation is an autonomic process and happens at clitoris and other body areas. Female orgasm has involuntary contractions of pubococcygeal muscles surrounding last third of vagina. Clitoral stimulation must spread, and this depends on personality and socially conditioned inhibitions. Orgasms differ in completeness and emotional satisfaction.
Females do not have equivalent of ejaculation.
Females can have orgasms by coitus but not by masturbation {masturbatory orgasmic dysfunction}, orgasms by masturbation but not by coitus {coital orgasmic dysfunction}, or only sporadic orgasms {random orgasmic dysfunction}.
male
Males can have primary or secondary impotence, premature ejaculation, and inability to ejaculate. Squeezing glans penis can temporarily inhibit ejaculation.
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Date Modified: 2022.0225