- COCK SOCK
- COITUS
- COITUS INTERRUPTUS
- COJONES
- COMBINED ORAL CONTRACEPTIVES (BIRTH CONTROL PILLS)
- COME CUP
- COMING TOO SOON
- COMMANDO
- CONDOM (FEMALE)
- CONDOM (MALE)
- CONSENSUAL NONMONOGAMY
- CONSENT
- CONTRACEPTIVE IMPLANT (NEXPLANON)
- CONTRACEPTIVE PATCH
- CONTRACEPTIVE RING or NUVARING
- COPPER IUD (PARAGARD)
- CORNHOLE
- COSPLAY
- COWGIRL
- COWPER’S GLANDS or BULBOURETHRAL GLANDS
- CRABS (PUBIC CRAB LICE)
- CRACK A FAT
- CRANK
- CREAMPIE
- CROSS-DRESSER or CROSSDRESSER
- Crossfading
- CROTCH ROCKET
- CRUISING
- CRUMPET
- CRUSH
- CRYPTORCHIDISM
- CRYSTAL DICK
- CUCK QUEEN
- CUCKOLD or CUCKOLDING
- CUFFING
- CUM (COME)
- CUM SHOT
- CUMDUMPING or CUMDUMP
- CUNNILINGUS
- CUNT
- CUNT TORTURE
- CUPID’S HOTEL
- CURVED DICK
- CUT
- CYBERSEX
- CYSTITIS