Operation: Squeeze Toy 
Sex Dictionary: S
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safeword: the code phrase or word used in any sort of sexual activity that really means "Stop NOW."
sadism: Sexual stimulation associated with the desire to inflict pain, physical or mental on another
sadomasochism: Both sadism and masochism existing in the same person
scat: sexual acts involving feces (poop, shit)
schlong: Jewish term for penis, often used in American slang
score: To achieve sexual intercourse
scrotum: The pouch or sac with contains the testicles
semen: The fluid produced during ejaculation of the male
shoot: To achieve orgasm
sloppy seconds: refers to having intercourse with someone after someone else has first
smegma: White matter which collects under the foreskin of the uncircumcised penis
snatch Slang for vulva
snowballing: a male swallowing his own ejaculate after it has been in someone's ass, mouth, etc.
sodomy: often simply refers to anal sex; however, the actual dictionary definition includes anything considered "unnatural or deviate sexual intercourse" which may include everything from oral sex to sex between partners of the same gender
spanish fly: An alleged aphrodisiac that consists of some formula with powdered blister beetles. When ingested this concoction is actually very dangerous and can cause infections and irritation of the bladder. Can be fatal.
sperm: The fluid that erupts from the penis during ejaculation
splash conception: becoming pregnant from semen that drips from the anus and into the vagina after anal intercourse
spunk: British term for semen
stallion: A male who possesses a very large penis
straight: A heterosexual
stud: A male who is in great demand as a sex partner
stud muffin: An incredibly tough and independent woman; not to be confused with stud
suck off: To perform oral intercourse on the penis
swinger: One who accepts free love from those married or unmarried
swinging: consensual sex involving the exchange of marital partners for sexual purposes
swish: A male who behaves in a feminine manner
switch hitter: A bi-sexual