S - Escort Info (for the Newbies)

Safe - Sexual activity in which various measures, such as the use of condoms or dental dams, are taken to avoid disease (as AIDS) transmitted by sexual contact. e.g. All activities were safe.
San Juan Capistrano - BBBJTC and she swallows.
Sandbagger - A subjective term for a review (or reviewer) that misleads the reader by giving unwarranted praise to a provider.
Sans - Without. e.g. She provided french sans beret = BBBJ
SC - Strip Club
Scat - Defecation on your partner or feces play.
Screening - A provider or agency does a pre-session background check on a new client.
Self Post - A provider or agency poses as a hobbyist, and posts a highly positive review of herself or agency to increase business.
Self-Service Masturbation - e.g. "It was a self-service jack shack" = no contact with the dancer, but the man can masturbate.
Sensual Massage - Not usually full service. expect only massage (usually nude or topless) and handjob, but more services might be available.
Session - Paid time spent with a provider.
Sex Worker - Catch all phrase sometimes used to describe escorts, hookers, prostitutes, strippers, peep show workers, topless waitresses, etc.
SFH - Sex for hire.
SG - Street Girls
Shemale - Transexual, particularly one who is living as a woman, but hasn't had SRS. Penis may or may not get erect.
Shill - A hobbyist who writes unwarranted positive reviews in exchange for discounts or special favors from an agency or provider.
Sixty Nine, 69 - Partners perform oral sex on each other simultaneously.
Slam or Slammed - An unwarranted harsh review or abusive criticism of a provider.
SO - Significant Other
SOMF - Sat On My Face
South of the Border - Genital Region
Southern France - BBBJ
SP - Service Provider
Spanish - ATM (Ass to Mouth)
Spanish In Australia - Penis between breasts
Spinner - Very petite, small, thin girl
Squirting or Squirter - Female ejaculation, a provider who ejaculates
ST - Short Time
STD - Sexually Transmitted Disease
Sting - A female police officer poses as a prostitute to apprehend unsuspecting johns, or a male police officer poses as a john to apprehend unsuspecting prostitutes.
STR - Short Term Relationship
Street action - Prostitution that is solicited on public streets. Prostitutes (usually on foot) are picked up by Johns in motor vehicles. Sexual acts may occur in the vehicle, or at another agreed upon location.
Stroll Path - An area frequented by street walkers
Summer Teeth - Her teeth; Some are there, some are not
Sunshine or Sunny - Without a condom (i.e. No raincoat)
SW - Street Walker
SW - Sex Worker
Sybian - A mechanical sex device that is in the shape of half-barrel with a dildo attachment mounted in the middle.