It was some awful '80s or '70s film about some guy who any sexual act he would do turned him into a flesh eating demon. At the end I believe his girlfriend is captured so he sleeps with a whore and becomes full demon and at the end, everything turns out well. Any guesses?
Sounds like My Demon Lover (http://www.imdb.com/title/tt0093589/). I don't remember the plot line of that movie, though, so you'll probably have to find out for yourself.
yes, this is definitely it, Hahahaa, oh memories. What a crapfest.