I think bi-curious means like you are curious about the same sex, but still like the opposite sex. You are CURIOUS, meaning you wonder more I guess? And bi is really liking both same sex and opposite sex. I am guessing this is what he means.
They like to keep it private, maybe they are not even open to anyone else, so they keep it to themself.
I'm Gay, have been since I was born. Accepted it when I was around 19, came out when I was around 24. To quote a line from Rent: "I'm more of a man than you'll ever be and more of a woman than you'll ever get".. LOL I love that line! I have alot of straight man qualities, most of my friends didn't believe me when I told them I was gay.. lol I can't help but to fall in love with whom my heart tells me to love.
Straight as an antenna. PS: I appreciate Green Gambler for admitting his sexual preference without any inhibition. It takes balls to do that and not everyone is capable of doing that.