A major theme of the movie is the relationship between love and sex.
Four men and a woman are in a bed; one of the men is clothed; side and rear nudity only.
A man finishing a shower opens the curtain and stands naked talking to another guy. Then he's dancing around before dressing. There is a second shower scene even more explicit (full frontal).
We see a fax of a review written on the naked back of a man.
A man masturbates. The masturbation is real, but he is discretely obscured by a suitcase.
A naked man models for a female photographer (front and rear nudity).
A naked man is asleep face down in a bed with another man.
There is an S/M scene that includes a man paying another man to let a third man perform oral sex.
The aftermath of another S/M scene involves loosing a man from a restraint.
A man strips naked on the street (front and rear nudity).
The other sexual situations are merely discussed.