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1.
Either one of the two types of spirits known as succubi or incubi. A succubus is a female spirit while incubus is male; both are believed to be able to have sex with people of either gender. It is also said they can be summoned through occult means.

Definition 2: Someone really really good at having sex or someone obsessed with sex; or both.
She gave up on human guys and started fucking with a sex demon.

She is always so horny I swear she's a sex demon.

von Draconian2300 7. Dezember 2008
 
2.
A sex demon is one who is evil/vicious when having sex.
Which can also mean sex demon's enjoy havong hot dry sex and fucking non stop.

prostitute: that man was a sex demon

Man: After seeing your rack i think i like men now
von luviee 2. Oktober 2008