How do you know if he's bi?

Anonymous
He's the manliest man as any man could ever be manly💪💪💪. We've been a relationship for well over 6 years and never had a question or doubt that he's totally straight. Now all the sudden he wants a little "butt play" action. And has hinted at having the desire to wear stocking/fishnet/lingerie. What's up with that? Is this normal?
How do you know if he's bi?
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