No nudity. Only implied off-screen sex.

It begins with a girl pulling down a man's pants to his underwear.

The main couple are in bed together but no nothing sexual.

It starts out without any profanity, but the f-bombs begin with the sister, and contiues sparsely throughout.

There's one scene where Sophie describes what Pete's missing sister might be doing, using very graphic language about oral and anal sex in a gang bang.