Madame - Proprietress of an escort agency
Mall or Escort Mall - A website that advertises many different providers. The providers may be independent or agency, and may or may not be associated with each other, or with the mall.
Mamasan - Female manager of an asian massage parlor (AMP).
Man in a boat - Clitoris
MBR Multiple Bell Ringing (MSOG)
Mediterranean - Anal sex (e.g. "She took me on a trip to the mediterranean.")
Merkin - Pubic hair wig.
MG - Massage Girl
MIB - Man in blue, law enforcement officer.
Mileage - A subjective term that describes value for money and/or how accomodating an escort is. Good mileage usually means she either charges less than average, provides better L/A/S than average, or both.
MILF - Mother I'd Like to Fuck.
Mish - Missionary position, Man on top during intercourse
Missionary - Man on top, girl on back.
MMF, MFM, MFF - Threesome designations. e.g. MMF = male, male, female MFF = male, female, female.
Mohawk - A thin rectangular strip of pubic hair.
MP - Massage Parlor
MP - Multiple Pops (multiple releases)
MPA - Massage Parlor Attendant
MSOG - Multiple Shots on Goal (multiple releases)
Multiple Pops - She allows you to have more than 1 orgasm during the session (e.g. more than one or multiple pops allowed)