I just ask every guy I meet because I can never tell, you know?
However, smiling and sexy girlsfucking eye contact is a friendly gesture, so it is a lower stakes version of flirtation that some other bolder options.
Don't think of it as black and white:
Are you having a good time?
Otherwise, it's possible that you'll do something rash or foolish.
If you are a guy, how do you know or tell if your friend is bisexual?
It's a spectrum, and you could fall anywhere along there.
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