- M2M
- MAGIC WAND
- MAINTAIN
- MAN’S SHIRT
- MAP OF TASMANIA (TAZZY)
- MASOCHIST
- MASTURBATION
- MASTUWAITING
- MATANUSKA THUNDERFUCK (MTF) or HUMBLE WARRIOR
- MATCH
- MATURE
- MDMA
- MEAN QUEEN
- MEATOTOMY
- MEATSPACE
- MENAGE A TROIS
- MENSTRUAL CUP
- MENSTRUAL CYCLE
- MENSTRUAL CYCLE vs. MENSTRUATION
- MENSTRUAL FLOW or PERIOD FLOW
- MENSTRUATION
- MERCY FUCK
- MERKIN
- METEROSEXUAL
- METHAMPHETAMINE or SPEED
- MFM vs. MMF
- MIFEPRISTONE
- MILE-HIGH CLUB
- MILF
- MILKING
- MINIPILL or POP
- MIRENA or LILETTA
- MISSIONARY POSITION
- MISTRESS
- MITTELSCHMERZ
- MONEY SHOT or MONEYSHOT
- MONILIA
- MONS PUBIS
- MONTGOMERY NODES or TUBERCLES
- MORNING-AFTER PILL or PLAN B or ELLA
- MORNING WOOD
- MOTHER FIST AND HER FIVE DAUGHTERS
- MOUSE POTATO
- MTF
- MUFF DIVING
- MUMMIFICATION
- MUNCH
- MYSPACE