Operation: Squeeze Toy 
Sex Dictionary: M
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make out: To succeed sexually
mary: An effeminate-acting male
masochism: Where sexual gratification is achieved by pain
masturbation: Manual self-manipulation of genitals
matinee: A sex session in the afternoon
meat: The penis
mercy fuck: to have sex with someone out of pity rather than personal desire
merkin: a hairpiece for the pubic region, was used in the old days to hide syphilis symptoms such as lesions and sores
money shot: scene in porn films where the man ejaculates
monilia: a type of vaginal yeast infection
mons: mound of flesh located above the vagina
Montgomery nodes: tiny little bumps that form on and around the nipples after puberty; these are completely normal
morning-after pill: a type of birth control pill that is administered within 72 hours of unprotected intercourse to keep a fertilized egg from implanting in the uterus
muff: slang for vulva
muff diver: a man who performs oral sex on a woman's genitals; sometimes derogatory
mutual masturbation: Where partners manipulate each other's genitals