Operation: Squeeze Toy 
Sex Dictionary: B
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back scuttle: Perform anal intercourse
bag it: Wearing a condom during intercourse
ball: To have intercourse
bang: To have sex with
Bartholin's Glands: Two small glands near the vaginal opening that secrete lubrication during sexual arousal. These are the female equivalent of the male Cowper's glands.
B/D: Bondage and discipline
BDSM: Bondage and discipline, dominance and submission, and sadomasochism combined into one
Beard burn: When a man's facial stubble scrapes a woman's inner thighs or face during sexual contact
beef curtain: slang for the vulva, which is the collective term for the external female genitalia
bestiality: sex with animals
beating off: male masturbation (many variations)
beaver: Slang for female genitals
beefcake: Nude males depicted in photographs
bidet: Oval shaped porcelain bowl similar to a water fountain that women squat over to clean their genitals or stimulate themselves with. These are found is more European bathrooms than American ones.
bikini line: The area of skin around a woman's genitals that is visible when a bikini is worn. Many women shave their bikini lines.
bisexual: a person who is sexually or romantically attracted to both sexes
bitch: A mean, irritated, spiritless, snappy, bad mood, or ignorant woman or a feminine male
blow: 1) To perform oral intercourse on a male 2) cocaine
blow job: fellatio or oral intercourse performed on a male
blue balls: Severe need for a male to experience sexual orgasm, symptoms include cramps, pain or swelling in the scrotum, and irritability. There are no bad side effects other than feeling really horny.
boink: To have intercourse with
bondage: Getting sexual pleasure from being tied up
brownie queen: Passive partner in anal intercourse
bugger: to perform anal sex, often referring to sex with animals
bull dyke: masculine female homosexual
bum: British slang for "butt"
butch: A lesbian who adopts the masculine role
butt plug: A dildo-shaped object with a flared end that is used for anal or prostate stimulation