Some things you would rather not know

The class that Dr.Widman was invited to was very informative, almost too much so. I do believe that our gender is at least somewhat defined by biology but the findings of studies that try to track biology's influence on our behavior is not what I wanted to hear. For example, Dr.Widman talked about how we are serial monogamists, men really only care that a woman has his child and then wants to find another woman. He told us about a study which was investigating how involved men were with their children finding that less good looking men were more involved. Dr.Widman said that basically men that could not attract other women were more involved in their family because they did not have the choice to find others. This made me think about social constructions such as marriage and their use. If we are meant to be with multiple people why do we get married? When did that start?