Sexuality is fluid. Don't label urself.
I know I'm a lesbian just the idea of sex with a man repulses me. Don't get me wrong I have had sex with men but never liked it. But with women it felt right.

With the social acceptance of homosexuality changing in our favors more ppl are going to experiment. More ppl will come out. And more ppl will be protected.

Just remember with threesomes there's always risk. Make sure u create a line with him that neither of u will cross. And u need complete trust in each other.

Or u could always just have him watch.