Season 2: Episode 4: a character performs cunnilingus on another (no nudity).
There are 3 instances of non-sexualized full frontal male nudity in the entire show, and 2 of them are very brief and easy to miss.
A picture of a man with his penis out is seen briefly for comedic purposes.
Strippers in a strip club mostly nude with tassels and bikini bottoms.
There are two rows of fully naked men with their genitalia and penis's exposed at a fraternity party. The only severe nudity in the show.
Most episodes have no sex and nudity, just references.
A woman urinates in a man's mouth off screen. We hear it, and it's played for comedic purposes.
No actual sex scenes shown.
Throughout the show, there are some brief crude sexual references that are played for comedy, but are infrequent and passing in tone.