The events are related to the sexual liberation of the seventies. There is nudity in several scenes of males, females, and kids (the latter not in any sexual sense).
The movie opens with a beach scene of perhaps 40 people, mostly fully nude, many in family groups. Men, women, and children are seen fully frontally nude, including twin 7 year old girls who are seen playing briefly until they are summoned to their mother.
A young man and an older woman share a bath. Her breasts are visible above the water line. They are not romantically involved but an undercurrent of sex is in the scene. A man comes in and accuses the young man in the bath of having sex with his woman, but then makes it clear that he was just joking. The second man fondles the woman's breast in an aggressive, harassing manner.
A woman catches her husband having an affair. There is no nudity but he is having sex with a woman from behind.
A scene with a number of characters sunbathing at a terrorist training camp. Several European women are topless, others totally nude (full frontal and rear nudity). When criticized by one of the Arab trainers, the Germans claim that "fucking and fighting is the same thing."