Enemas can cause sexual arousal in both women and men because the bulbospongiosus muscle which starts in front of the anus contributes, in women, to clitoral erection and the contractions of orgasm, and closes the vagina, and in men, to erection, the contractions of orgasm, and ejaculation. Sexual sensation results from distention of the rectum by filling and dilating it with the volume of an enema which, in women, puts pressure on the back of the vagina, and in men stimulates the prostate and seminal vesicles. Also, contractions of muscles throughout the abdomen caused by expulsion of an enema can stimulate, in women, the uterus and vagina, and in men, the prostate, seminal vesicle, and internal penis.