As a matter of fact, in old days, it seems that husband's desire for the control over his wife was one of the reason for common big family. Though the lack of contraceptive method was another reason, more than that, there was a time when the purpose of successive pregnancy year after year was to tie his wife to the household. Well, in sexual act, the characteristics of the person appears extremely well. If one is care taking and kind, it will be so during sex. A violent man and egoistic woman will behave accordingly during sex.
Sexual behavior shows true nature of the person really remarkably.
Since it is to feel each other with entire body and spirit, climbing together, the expression of body and emanating aura cannot tell a lie. Needless to say, sex does not show everything of the person. However, in a certain aspect, sex will bring the human nature of the person to clearly visible surface.