Operation: Squeeze Toy 
Sex Dictionary: C
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castration: removal of the male genitals by a surgical operation
cervix: the entrance to the uterus in women, located at the top inside of the vagina
chakra: According to Taoist tradition, one of seven energy centers in the body
cheat: To be unfaithful to one's regular sex partner
cherry: Imaginary unbroken genital seal or object of a virgin woman, usually refers to an unbroken hymen
circle jerk: Where several men get together and masturbate together, doesn't have to be homosexual
circumcision: the surgical procedure of removing the foreskin of the male penis
clap: Slang for gonorrhea, a sexually transmitted disease
clitoris: the most sensitive external female sex organ, located near the top of the vulva and generally covered by a clitoral hood of flesh
closet queen: A male homosexual who hides his desires for other men
cock ring: A rubber ring made to fit snugly over the base of the penis or the penis and the testicles with the purpose of sustaining an erection. Controversial.
cockteaser: One who excites a male without carrying on to actual sexual relations
coitus: (pronounced "KWA-tus") Sexual intercourse
coitus in ano: Anal intercourse
coitus interruptus: Withdrawal of the penis prior to ejaculation
cold: Unresponsive to sexual relations
come: To achieve sexual orgasm; alternate spelling for cum
condom: a sheath of latex, plastic, or animal skin worn over the penis to prevent sperm ejaculating into the vagina to prevent pregnancy or the transmission of disease
cornhole: slang for the anus, also refers to anal sex
corona: Rim of flesh which forms the base of the head of penis
Cowper's glands: Small glands near the inside of the base of the penis that produce pre-cum in men. These glands are analogous to the female Bartholin's glands which also secrete lubrication.
crabs: Lice which infect the pubic area of the body
cum: semen
cunnilingus: stimulation of the vulva with the mouth
cunt: vagina, also used as a derogative reference a woman
cupid's hotel: Slang for a vulva