420: Refers to marijuana use

AC/DC: Bi-Sexual Person(s)
Adult: Euphemism for pornographic.
All Cultures: Person or couple who enjoys all fetishes and sexual activities
American Culture: Man on top, the missionary position.
Analingus: Oral contact or stimulation of the anus of one partner by kissing, licking, or sucking of the other.
Animal Training: Sexual activity with animals, usually dogs and women
Arts: Fetishes
B&D or BD: Bondage and Discipline use of various methods to restrain someone while administering discipline, usually done by a "master" to his/her "slave".
Back Door: Anal Sex
BBW: Big Beautiful Woman. Larger than average woman that is very beautiful regardless of size or weight.
BBC: Big Black Cock
BDSM: A combination of three terms: BD (Bondage & Discipline), DS (Dominance & Submission), and SM (Sadism & Masochism). A wide range of sexual activities having to do with power.  
Bestiality: Sexual activity with animals, usually dogs and women
BI or Bisexual: Someone that enjoys sex with both men and women.
Bi-Curious: Someone that is curious, interested in or has had limited Bisexual experience. Often someone willing to receive from same sex partner but not willing to go below the belt on another.
Bi-Social: Very much similar to Bi-Curious except that while in the moment one may have bi tendencies they do not find pleasure or arousal in watching or viewing members of the same sex during day to day events.
Bizarre: Unusual sexual desires
Bondage: The practice of restraining a person(s) for sexual pleasure. : A sexual fetish in which restraints such as ropes, chains, cloth or leather straps are used to bind, tie or hold a participating sexual partner. The person doing the binding is considered "dominant" while the person being bound is considered "submissive."
Bukkake: A Japanese sexual term that refers to showering a receiver with sperm from one, several or many men. It is always a sperm shower and, therefore, those on the giving end are always male.
Can Entertain: Someone that has a private location and is willing to invite others over.
Can Travel: Someone that is willing to travel, generally beyond 1 hour's drive.
Clean: Diseases and Drug Free
Couple: Two people, generally one male, one female.
CPL: Two people, generally one male, one female.
Cunnilingus: Oral stimulation of the vagina/clitoris
DD or DDF: Clean, disease and drug free.
Discipline: Spanking, bondage or similar practice intended to arouse sexual desire.
DP: Double Penetration, simultaneous Vaginal and Anal.
Entertain: Someone that has a private location and is willing to invite others over.
Exhibitionism: Showing off in public, involving nudity.
F: Female
Fellation: Oral stimulation of the penis
Fetish: Sexual stimulation via non sexual acts or objects.
Full Swap: A couple that enjoys sexual pleasure with others that includes anything up to AND including intercourse.
Gay: Homosexual, generally a male, but not always.
GBM: Gay Black Man
GWM: Gay White Male
Heterosexual: One who enjoys and has sex with only the opposite sex.
Homosexual: One who enjoys and has sex with only the same sex.
Hung: One with a large penis
HWP: Height/Weight Proportionate. Someone that is not overweight or underweight.
ISO: In Search Of
Lesbian: Gay women.
LTR: Long Term Relationship
M: Male
MBC: Married Black Couple
MBiC: Married Bi Couple
MILF: Mother I'd Like (to) Fuck
Moresome: More than four.
MWC: Married White Couple
NSA: No Strings Attached
Off-Premise: A swing club or party where there are no designated locations for play. This may or may not exclude the activity from actually taking place.
P/P: Photo/Phone
S&M or SM: Sadism/Masochism
Safe: Someone that is not at risk for becoming or causing a pregnancy.
SBF: Single Black Female
SBiF: Single Bi Female
SBiM: Single Bi Male
SBM: Single Black Male
SGL: Single
Sodomy: anal or oral copulation with a member of the same or opposite sex ; also : copulation with an animal.
Soft Swing/Swingers: A couple that enjoys sexual pleasure with others that includes anything up to but not including intercourse.
STD: - Sexually Transmitted Disease.
STR8 or STR or Straight: Straight, a Heterosexual person.
SWIC: Smooth Where It Counts
Swap or Swapping: Two couples exchanging partners
SWF: Single White Female
SWM: Single White Male
Unicorn:  In swinger lingo, a single female (often bi) sought after by many couples. They are thought to be so rare that they have attained the status of mythical creatures. Many couples go their entire swinging career without bagging a unicorn.
Vanilla: Person(s) who do not practice the lifestyle/swinging but associate  with those who do.
Versatile: Bisexual
Voyeur or Voyeurism: One who enjoys watching.
Water Sports: Urination involving sexual stimulation