There is no full nudity. The body painted women are clearly wearing bottoms and tops.
In a song and dance routine near the end, Flo is seen briefly reclining in a vibrating chair and appears to be enjoying the vibrations. This could possibly be interpreted as being orgasmic.
Actually, although the body painted women all appear to be wearing panties under the paint, some were not wearing bras, and nipples are visible.
In shots of the guard tower such as during the "dancing garbage cans" scene, a poster of a topless woman can clearly be seen in background.
Football team sequence, naked male rear ends seen. No frontal male nudity shown.
A man with a gun sneaks into a bathroom where a woman is showering. The shower curtain is transparent and we can see side nudity and her butt briefly. Another man is watching this happen on a huge TV monitor.
A woman in a dress walks onto a bus crowded with hippies. Topless women are in body paint and a man is shirtless. The shirtless man gives the woman a welcome kiss, which surprises her. A second man unzips her dress and the woman takes it off to reveal her bra and panties. A third begins painting her stomach.