At the beginning of the film we see a girl masturbate in a bath top, full frontal nudity is short, but visible.

Full frontal male and female nudity throughout.

Some of the frequent sex scenes are not simulated. For example, at least in one occasion, the woman is performing real oral sex (the penis doesn't appear to be prosthetic; the scene lasts only a few frames). In another occasion the man is managing to have sex from behind; his erect penis is partially shown (again only a few frames).