Back Door - The anus or rectum

Balls - The testicles

Bang - To copulate

Beat Off - To perform manual masturbation of the penis

Behind - The buttocks

Bestiality - Sexual relations with animals

Bi-sexual - An individual who takes part in sexual activity with both sexes

Bitch - A woman or girl who is promiscuous

Blast Off - To experience orgasms

Blowjob - The act of performing oral sex on a male

Blue Balls - Pain in the testicles from lack of ejaculation

Bondage - The practice of sexual domination of a sado-masochist quality, including restraints, humiliation, punishment, torture etc..

Bone - The erect penis

Boobs - The female breasts

Bordello - House of prostitution

Box - The vagina

Breasts - Either of two milk-secreting, glandular organs on the chest of a woman; the human mammary gland

Briar Patch - The pubes

Broad - Any girl or young woman

Brothel - A house of prostitution

Browning - To perform anal intercourse

Buck Naked - Completely naked

Bum - The buttocks

Bunghole - The anus

Burn - To infect someone with a venereal disease

Bush - Pubic hair of either sex especially if it's thick or coarse; often more associated with female pubes

Bush Dinner - Cunnilingus

Bust - Female breasts

Butch - A lesbian who is very masculine in traits and appearance

Buttocks - The rump formed by the two protuberances behind the hips on which human beings sit

Button - The clitoris