Hear me out.
The biological role of sex is reproduction.
What leads women to find men desirable is primarily their physical traits, many of which are fertility markers.
Therefore, women's bodies expect the selected mates to fulfill their role by impregnating them.
But contraception prevents women from having unwanted children in most cases, leading to an unsatisfied biology that identifies the selected mates as infertile and thus not fit to reproduce.
So the biology drives women to cheat on their partners in a desperate attempt to find men that can reproduce, since the previous men were unable to.
The biological role of sex is reproduction.
What leads women to find men desirable is primarily their physical traits, many of which are fertility markers.
Therefore, women's bodies expect the selected mates to fulfill their role by impregnating them.
But contraception prevents women from having unwanted children in most cases, leading to an unsatisfied biology that identifies the selected mates as infertile and thus not fit to reproduce.
So the biology drives women to cheat on their partners in a desperate attempt to find men that can reproduce, since the previous men were unable to.
