>>12264101male evolutionary strategy in regards to behavior is to be alpha. In order to successfully reproduce the male needs to be strong and powerful etc etc whatever synonyms you want. The point being he has to be in control of his environment by bringing to heel anything that can possibly threaten it rather it be nature itself, animals other humans. Nothing is more beta then getting ass raped by another dude and you could argue nothing is more alpha than ass raping another dude but as anon posted above ass raping another dude is about power.
If you have some pussy there is no need to be ass raping dudes, you can ass bang women if you prefer ass. A man to stick your dick offers you nothing unique to entice you to do it. Most of the time this expression of power over other men is in hyper masculine settings like prison.
A woman's evolutionary strategy on the other hand completely revolves around sexuality. There is no taboo about being bi, in fact it is encouraged by most men even in ancient times with harems I imagine. Two things you like will always be better than one thing you like. In the past I imagine bi was pretty rare however only high end harems most likely had bi women, or possibly prostitutes and being gay was near non existent. Women can only be full dike gay in an environment where men have built a society affording them the luxury to do so, meaning they dont have to have a male mate to survive.
tldr being gay doesnt hurt a females evolutionary strategy while it does a man under most circumstances, it is really that simple