The Anatomy and Physiology of Sex Pierre Rouzier, M.D. University Health Services

USC School of Medicine Class of 1984

Where do people learn about sex? friends brothers or sisters parents movies books, magazines school health professional trial and error

Definitions Anatomy - body parts Physiology - how the parts work “Sexually active” - many definitions…. Orgasm - peak of sexual arousal. Male=ejaculation. Female=muscular contractions of the pelvic floor muscles. Masturbation - stimulating yourself to the point of orgasm. Fellatio - oral stimulation of the penis. Cunnilingus - oral simulation of the vulva.

Great questions and comments from students “…umm… can I ask you another question? “…this may embarrass you...” “I don’t think I’ve ever had an orgasm” “can you send me to a plastic surgeon” “I have a friend who …” “I’m really scared” “I did something really stupid” “ I don’t think any of my friends have ever heard about any of this stuff...”

Male anatomy

Female anatomy

Menstrual Cycle Days 1-4 = period Day 14 = ovulation Day 28 = “last day of cycle” Day 1 = first day of period sperm live 2-3 days egg lives 2-3 days pregnancy possible days 13,14,15

Male sexual physiologic response

Female physiologic sexual response

Masturbation Only true SAFE SEX Old myths (going blind, hairy palms, etc.) ? Men more than women “Technique” - hands, lubrication, vibrators/etc. other, “audiovisual aids” useful for “sex therapy”

Foreplay everything you do to get ready for penetration Key ingredients - communication, time, patience, gentleness LUBRICATION (saliva, other) Manuel, oral, vibrators (other toys) Sensitive zones - clitoris, “G spot”, penis, testicles, nipples, perineum, rectal, toes, ears, neck Key responses - hot, wet, hard ??orgasm?? EXCITEMENT

Oral sex

Condoms Use them! Have partner put them on. Let them be part of foreplay.

Female condom

Intercourse Penile - vaginal penetration

Positions

Positions, cont.

Sexual problems male female Premature ejaculation Impotence Lack of desire Retarded ejaculation Priapism Bent penis (Peyonie’s) Orgasm problems Vaginismus “pelvic pain” Lack of desire