^^^^^ CB; If by your theory you mean monogamy, the earlier date for the origin of the human species doesn't support that theory more than a theory that the matings were not monogamous. Again, childcare was very communal ("whole village"). Women wouldn't have to rely on their male sex partners to help care for children, because there are a whole bunch of sisters and brothers (who are not sex partners because of the incest taboo) who do childcare together. This is what undercuts your theory that women would be looking for special, caring attention in the sex act as an indication of being more caring in childcare. Sex partners were probably not "wife-husband" in the modern sense.