Sexual behavior that diverges from the norm.

the whale tail is the shape formed when a g-string rides up high over a womans trousers

people whose vocabulary makes up approximately 95% of this site.

A person whose sexual interests or behaviors are viewed as either extreme or outside the subjective norms of the person making the reference.

Usually a pejorative label used to express disapproval of a perceived sexual interest of another.

Can be used in slang as a synonym for for slutty or a horny person. Or simply someone with a large sexual appetite.

A person who constatnly has sex on their minds and thinks about different ways to either encounter a sexual act with someone or in any situation make the opposite sex do a sexual act with them. This kind of person is usually very forceful and demanding during anything sexual but can usually get away with it due to their looks or anything hot about them.

One who has sexual thoughts frequently and/or is perverted often.

A more polite term for a "whore" or "slut".
Could be interpreted as a compliment / not as an insult.
A cool person who's not quite a whore, yet is still perverted enough to earn a sex-related title.

SD — abbreviation of "Sexually Deviant". Intended to replace usage of the word "gay" in someone's vocabulary; specifically when such a person has developed a habit of saying the word "gay" to describe something "bad", though at the same time wants to stop promoting (and thus legitimising) the artificial idea that "gay" means anything else other than a physical sexual fetish for members of the same sex and is therefore no different than any other form of sexual deviancy (fetishes) being completely carnal in nature and illegitimate as an "identity" for a human being or group of human beings. Biblically "sodomite".