The men are seen shirtless when they swim.
There are some scenes set in a male shower room, however we only see them from the waist up.
On one occasion we see a man's buttocks.
There is a scene in which we see a man drying between his buttocks with a towel. No nudity is seen, and the moment is played for laughs.
There are occasional sex references in banter between the men. For example, a man talks about his friend that "once had six women at once" and a man says that he would prefer to be in the shower with his wife than with the group of men.