Several sex scenes. A number of them are brief, but there are a few that last for a bit, and moaning is clearly heard in one of them. Most of these scenes contain minimal nudity (with exceptions).
There is a scene where a woman has a man act out a rape fantasy, which ends with her being displeased at his lack of aggression and using a vibrator to climax as he masturbates somewhere else and leaves.
Nudity in the movie is still usually in a sexual context, although it is not frequent or long-lasting, with some of it centering on old(er) women.
One offscreen instance of a fellatio and handjob, as well as a few offscreen near-instances of male masturbation.
Multiple references, though not exactly in a joking context for the most part.