Some light flirting. In one scene, a female character goes swimming in an oversize t-shirt/underwear.
Tyler is shown peeing but no nudity is shown.
There is two short kisses between a woman and Tyler (in a car), at the wrestling match, outdoors.
No Sex. The closes thing to nudity is is when a man's butt crack is shown for a couple of seconds, while he runs by a campfire, because his shorts start to slip down.
A handicapped man spends a good deal of the film tracing around the countryside and even in one scene acting out drunk around a campfire in his underwear.