|
The question is, what triggers the lactation in a man? In women, currently, hormones released by the placenta begin the series of events that ultimately lead to the woman's body knowing it is time to lactate. After that it is only a positive feedback loop that keeps it going--stop draining the boobs regularly, and the milk production will stop.
It wouldn't be very "selfish gene" of them if men's bodies started producing milk any time they saw any baby. Maybe the baby could produce a pheromone that the man's body would recognize as genetically his own. But that could lead to serious societal problems. Being able to hide or misidentify the father is one of women's evolutionary strengths.
|