There is a scene where MDC is in a hotel room listening to the sound of two gay men having a sexual romp in the room next to his. Nothing is seen and nothing graphic is heard, just the sound of banging and some muffled moaning is audible.
There is a brief scene where MDC is looking at an erotic magazine photo spread of a partially nude woman -- only her bare breasts are visible.
There is another scene, about two minutes or so long where Jared Leto's character calls for a prostitute to come to his room. She strips, and we briefly see her buttocks and bare breasts, however sex is only implied as the scene cuts to the "morning after".