Also, you've got it the wrong way around – the roughly similar brain structures don't make them gay. It's them being gay that makes the structures roughly similar. Brains aren't inherently sexed, but actions and thought patterns shape the brain, and thus similar patterns of thought and behavior (whether by sexuality, socialization, culture, etc.) can produce similar results, just like a repeated experiment. But I think it's very clear to everyone who lives in a society that gay men are not just like women regardless of brain scan results. And if you think they are, try being male and sending a dickpic to your tinder vs grindr matches and report back your results.