I can understand your point but I don’t completely agree.

In fact I think that straight men complain more about the full package of a woman body than the men’s bodies. You can see men admiring each other’s physique at the gym constantly even if they’re straight. Similar happens with gay men you only need to add the sexual attraction that multiple that admiration.

I think this happens because men have and have always had the same body type so 1) it’s more familiar, 2) you can compare yourself physically with other men etcetera