Because once you've reached your "correct" sexuality, everything makes sense. Suddenly you know why you've felt certain ways towards certain situations. And sometimes it's not even a concept of confusion at all-- some people just know from the get-go.

There's plenty of gay people that I've met, telling me gay stories about their childhood, and how they figured out they were gay. And we even read a reddit thread together about gay people telling the differences between having sex with both genders. It's something that people figure out, or just already know.