There is no live human nudity in the film. Art drawn on vans shows show breasts, mostly in silhouette, briefly.
No visible sex stronger than entangled cuddling is shown; no nudity. A woman being sexually harassed is rescued. Sex is implied to have occurred with various pairs and triples in the vans, but not shown. A married woman is shown running around to various vans to have sex with strangers. We hear her and a man having sex and see a car bouncing up and down.
A wet t-shirt contest results in nipples being slightly discernible through thick fabric on a couple of women.