Dolly Pelliker brings someone home for the night. You can hear someone say "Oh God" but it definitely wasn't a moan.
One Sex Scene, where Drew and Karen have sex together, no nudity is shown, just Drew on top, movement, covers on top of them.
About 25 minutes into the movie, Karen briefly exposes her breast to a nuclear plant co-worker who is annoying her.
About 26 minutes into the movie, an old woman is in a company shower and her breast is visible. The rest of her lower body isn't seen.