I Dreamt Under the Water(2008)

Love is a drug; sex, an addiction.

Antoine, a handsome boy in his 20s, falls for a straight best friend who does not reciprocate, and being a junkie exits the film quite early. Enter a girl, who seems to make him happy again, after he has tried living as a rent boy with men, having some familial, financial difficulties. But the girl is a junkie too.