(Unrated Verison) We see full frontal nudity with one of Christian's many one night stands. Aaron is seen from the back side with his butt in full view with sex implied. After the airport scene we see Christian and Aaron have sex in an extended, passionate scene. Aaron's backside is shown several times. Though the characters are fully nude, penises are hidden by camera angles and strategically-placed arms and legs. The next morning, Christian gets out of bed and there are extended shots of his backside and a glimpse of pubic hair.
Christian performs oral sex on a straight guy (you see his head bobbing up and down between the guys legs, while the other guy groans in ecstasy).
Christian's butt is seen in a jockstrap. Christian's butt after sex with Aaron, can see Christian's pubic hair while sitting on the bed.