No nudity.
The female lead is seen in her underwear several times.
One male character and the female lead wake up in bed together several times.
One male character plays with a sex toy.
There is discussion of sexual situations including reading from a diary of sexual exploits.
Sex is referred to several times by one or another of the characters by sign language (inserting the finger of one hand into a loop of finger and thumb on the other hand).
One character spies on a couple having sex and is shown jerking off as he watches. The couple is heard but not seen.
One character looks at the main character sleeping in her underwear and then goes in the bathroom and is heard jerking off. The female character starts to go to the bathroom and stops when she hears him.