20 years ago Mel Gibson was asked about his 'nude scene' in Lethal Weapon.
His reply was along the lines of, "What nude scene? Oh, you mean I showed my butt."
He felt that wasn't a nude scene and had a healthy response to what he thought a senseless question.
The bare butts in South Pacific are realistic and a very funny sight gag. It is probably very mild compared to what really went on during WWII in the islands.
"If my life weren't funny, it would just be true. And that would be unacceptable."
--Carrie Fisher