orgasm | physiology | Britannica
orgasm, also called Climax, climactic physiological state of heightened sexual excitement and gratification that is followed by relaxation of sexual tensions and the body’s muscles. Orgasm is marked by a feeling of sudden and intense pleasure, an abrupt increase in pulse rate and blood pressure, and spasms of the pelvic muscles that cause contractions of the lower vagina in the female and contractions of the urethra and ejaculation by the male. Males and females are physiologically capable of experiencing orgasm from infancy, and children who engage in masturbation or sex play may achieve this sensation. Orgasm can occur while a