Female pubic hair shown briefly, just hair. Not sure that really counts as nudity.

There is scene where the main character pretends to be a girls boyfriend and has sex with her.

There is a scene in a sorority where some women are seen topless briefly. and the nerds watch from cameras they planted earlier. This scene doesn't last very long.

A plate has a topless woman on it

There is a brief scene in a sorority where some women are seen topless again.

A bunch of men are shown mooning the nerds. Several bare buttocks are shown.

Some marijuana use, and some references, and a few of them get high in a couple of scenes.

A boring party is livened up through the use of what a character calls "wonder joints" that everyone smokes.