There's a lot of ignorance and a lot of half baked theories floating around. Even when there are scentific studies on the topic, the results are uncertain. There was a scientific study a few years ago that claimed that the more older brothers a male had, the more likely he was genetically to be gay. Now perhaps this is true statistically speaking, but obviously there are plenty of gay men who had NO older brothers. And there are plenty of straight men who had multiple older brothers. So yeah, statistics aren't that useful either, lol.