With Regard to Control Over Sexual Relations,what Have Anthropologists Frequently

With regard to control over sexual relations,what have anthropologists frequently observed?

A) Human sexual activity is increasingly random.
B) Fathers in most societies have given up trying to restrict adolescent sexual activity,but mothers have not.
C) The virginity of young girls is no longer an adult concern in most societies.
D) Where adolescent sexual experimentation is accepted,young people usually marry soon after reaching biological maturity.