I don't quite remember what episode but there was a part where Billy and Steve were talking while taking a shower at the school.

There are three bath scenes though. Two of the bath scenes are bubble baths.

There are scenes that take place in a bathroom, but not a typical shower scene".

Clay is in the shower thinking about Hannah.

There is also an Easter egg scene featuring all the girls in the communal bath. It is possible to play through the game without ever seeing the scene if you don't have the right item.

Technically a bath.

There is an optional scene that allows the player character to spy on two of his female classmates while they are in the shower.

Quite a bit of nudity (mostly from main character) in this film. She is shown naked in a tub masturbating twice. She gets naked again and gets in the shower with the creature. She's also naked again with him in the bathroom shortly after.

Plenty of shower scenes, including Piper and Alex having sex in the shower

With an orangutan, no less!

Not technically a shower scene, but the main character is seen giving his mother a bath. There is no nudity.

Joey gets an acting part as Al Pacino's b**t and is shown in the shower.

There is a short shower scene that doesn't show any nudity and is non sexual.

Yes, episode 1, season 1, Rick, Morgan and Duane take a shower.

Nate has a shower scene

Including one where George has a fantasy about Izzie, Meredith, and Cristina showering together. No nude bodies are shown except for upper chest (ending around cleavage) and legs.

S01E01, S03E01

Both shower/bath scenes are of minors, though nothing "important" is shown.

Quite a few

A bathtub scene

the dad goes into the room that his kid wants him to check out and he sees naked women in the shower and the makes out with her

There's a shot of Finn singing in the shower in Season 1 and Mr Schuester is watching. You only see his face, ankles, and a bit of chest.

Part 3 episodes 32/33 and Part 4 episodes 34 and 45

jasper had a good time

yes, and the woman showering is seen being spied on.

Quite a few.