Your LifeAccording to Dr. Helen Fisher, the biological anthropologist, there is an ancient human tendency to partner and re-partner, which she calls the “four year itch.”  A long time ago, it was assumed that if a child lived to see age four, he or she would survive. The biological parents were then free to move on to new sexual adventures, and the child would be passed on to the group, at which time the “it takes a village” mentality would kick in. This …