This is quite untrue, though Kung rules are somewhat different from American rules on the same subject. Also, the Kung are more straightforward in their approach to lapses in sexual conduct than Americans seem to be. As a rule, children's sexual play is ignored by adults as long as the children don't draw it to the adults' attention. Adults don't officially approve of their children's sexual play, but they don't care much about it, either. Children's sexual play is not seen to have consequences in the real world.
Children play sexually with their own and the opposite sex, and occasionally even with siblings.
Sometimes boys force their sexual attentions on girls, who don't much like it but don't appear to be traumatized by it, either. None of this activity is considered appropriate for adults, but it is certainly not considered immoral. The general feeling is that children will grow out of it. In the videotaped lecture I said that there is no reported homosexual activity among Kung adults, something I found hard to believe. This turns out not to be the case.