One who is in constant need of sex (in the form of intercourse, masturbation, etc.)
1. d00d: I can't stop humping my pillow.
mang: d00d, you're such a sex fiend.
2. d00d: Did you knock that pussy hard?
mang: d00d, I need more pussy!
d00d: Mang, you're such a sex fiend.
Somebody who is willing to have sexual intercourse with someone based on instant attraction, due to their predisposition to sexual acts in general.
Ele: I just saw him across the club and next thing I know we were having sex.
Dora: Oh, you are such a sex fiend!
a person male or female who is sex crazed and always horny
they can't get enough sex and that includes masterbation
also known as a sex addict
Man 1:Damn my bitch is a sex fiend from hell, she always wants to fuck im getting too tired for this shit.
Man 2: Dude i don't see your problem.
Man 1: Why don't you fuck her then and see how long it takes you to get tired you mother fucker
one who has an addiction to the wild orgasms due to sex
stef is a sex fiend, she needs it all the time!