26 minutes in the movie, we see Seth Rogen's butt from the side.

42 minutes in the minute, we see Dave Franco's ass as he is making love to a girl.

57 minutes in the movie, there are a bunch of extras naked.

14 minutes in the movie, Zac Efron and Miles Teller both have hard-ons and have to lie on the toilet to be able to pee in it.
We can see both Zac Efron and Miles Teller's butts in that scene.
15 minutes in the movie, Michael B. Jordan is coming out of the bathroom wearing nothing but a towel. From the bulge on the toilet, one can clearly tell he is packing big and he is cut.