Marty and Teddy compare their genitals in a locker room, both are nude. Marty's butt is briefly seen.

Marty and Eva pretend to have sex behind closed doors as a horrified Teddy eavesdrops.

Marty removes his towel to reveal the outlook of his penis in order to encourage Ted to get undressed in front of him in the locker room. They talk about pubic hair, hairless penis and balls, and Marty praises the penis size of his son, Ted. There is no full frontal nudity in this scene.