Guys: How can a girl know if you are gay, heterosexual or bisexual without asking you?

I have a crush in a very cute guy, yet I think he might be gay. I don't want to sound prejudiced, yet he's mannerism are very delicate and even when he appears physically manly he's voice also sounds feminine.
Guys: How can a girl know if you are gay, heterosexual or bisexual without asking you?
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