Operation: Squeeze Toy 
Sex Dictionary: F
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faggot: A male homosexual
fairy: A male homosexual
family jewels: The testicles
feel up: Touching a partner with your hands, can include the body and/or genitals
felching: consuming the resultant semen after anal sex
fellatio: stimulation of the penis with the mouth
female ejaculation: Some women are reported to squirt clear fluid that is not urine during intense orgasms
femoral: intercourse where the penis is slid over or up the outside of the vulva without being inserted into the vagina
fetish: An object or part of the body which is normally considered non-sexual but which arouses erotic feelings such as leather, rubber, fair, feet, panties, and often strange or exotic in nature
fisting: inserting a whole hand into either the vagina or the anus
fist fuck Fucking a vagina or rectum with a hand or fist
flagellation: Whipping or beating to sexual orgasm
foreskin: skin covering the head of the penis in uncircumcised men
french kiss: Kissing while touching tongues. A book can be written on this subject alone.
french tickler: a condom with ridges, bumps, or something else designed to give women extra stimulation during intercourse. Not reported to work above and beyond what the man is otherwise capable of.
frenulum: a particularly sensitive part of the male penis that is located just below the head on the side of the shaft that faces away from the man
frottage: sexual pleasure from rubbing against another person
fuck buddy: A casual friend one has sex with. The relationship isn't serious and in these cases the people involved usually trust one another to help relieve sexual tension without "fucking" up the friendship.
full house: Having more than one venereal disease at the same time