Josh and Amanda are shown having sex from the side, fully nude. His butt and her breasts are shown from the side. When they finish he rolls off and they're shown from above, her breasts and his chest visible. They're very sweaty.

They're shown having sex again closer up with a heavy focus on her breasts, close up as he kisses and caresses them.

Josh poses nude for Amanda's drawing. He's shown from the side with privates hidden.

These scenes are all early on. No nudity after those.

A brief sex scene in a private bathroom later on with no nudity.