A person that lives a life of promiscuity is someone that's considered 'promiscuous' - meaning they are very sexually loose and not at all bothered about remaining loyal to one sexual partner.
E.g A man that can't go to a bar without ending up sunk to the nuts inside someone else by the end of the night, or a woman that can't keep her legs closed and hands sex out on a platter to others. A slut, basically.
Also the name of a 2006 mainstream song by Nelly Furtado featuring Timbaland.
"Promiscuous girl, you're teasing me!"
Damn yo, Mike can't stopflirting with chicks behind his wife's back, man is way too promiscuous!
12 step recovery jargon referring to someone new who talks about how great life is, now that they'resober. Usually meaning that the person is out of touch with reality.
The new guy seems pretty happy for a dude who has no job, no money and no family. He must be on a pink cloud.