Having gay sex does not necessarily make you gay.
{male perspective}...you could make love to a thousand women, but suck one cock,,,,fag for life!
This isn't how evolution work.
Sure it is.
Ant eaters grew long snouts so they could reacht the food.
There are wasp's? in africa that have penis's longer than their body, so they could reach the females opening, out of necessity. As a matter of fact, they can't even get to their mate without the help of some ants.
It only stands to reason (adds a few million years) that eventually men would reproduce, or become asexual.
Shit, if a spider could insert a probe into a cock roachs brain and steer it like a limo, anything is possible.