Someone said :
"Curiosity" is not a sexual orientation. You're either bi or gay, not "curious".
A gay bar would be a good place to start.
Who is to say?
Sexuality is self-identifying.
Some may see themselves 5% gay, or part-time bi, or bi-curious, or curious, etc.
It's not like there are EU grants attached! Whatever makes him comfortable.
The only standard we can offer is our own, and anecdotal evidence from others, including definitions used in some academic works where they feel the need to draw a line to better control their data.
This guy is not data, and I have no encline to control him...