[GladesGuru]

"Biologically speaking, their offspring have a better chance of survival overall if they are of differing paternity."

The stats on abuse of children by other than the birth father would belie your statement. This would also mirror the usual situation in the animal world, where the male often kills the offspring and then impregnates the female in order to assure success of his genetic preservation efforts.

Might I ask where you got data to support your above quoted statement?

[Melas]

The stats on abuse of children by other than the birth father would belie your statement. This would also mirror the usual situation in the animal world, where the male often kills the offspring and then impregnates the female in order to assure success of his genetic preservation efforts

That may or may not be true, but in either event, it's not biology. Biologically speaking, a female's genes have a better chance of surviving if she varies the paternity of her offspring. The down and dirty science is simple: Multiple paternity minimizes any chance of unfavorable heterozygous gene pairings.