Reply #40: It was an evolutionary advantage for a woman to be bisexual [View All]

[Nikia]

I have read this theory two different places. One book said that men tended away from monagamy. Since many prehistoric men would leave their female partners (or die), it was advantageous for a woman to have a partner who was not a man to help raise her children.
The other book had a similiar arguement except that it said that non alpha males tended toward monagamy. Alpha males tended toward monagamy with many affairs on the side. A woman with a guarenteed sterile partner (another woman) was an ideal woman to have an affair with. The alpha male could be assured that the children were his but be assured that his children had someone helping raise them.
I think that it makes some sense. Both books said that there are more bisexual women than bisexual men and that gay women becoming exclusively lesbian at a later age (old enough that they would have had a chance to have children) than gay men. I've seen varying statistics on this so I don't know.