I'm new to the site, but I regularly volunteer to help people regarding their sexuality (in a professional environment).
I would just add to the conversation that a desire or curiosity to suck a cock is just that. It doesn't mean you're gay or bi or something else - it means you've got an itch to try something new. I have always feared yet wanted to sky dive. If I do it once, then I say that I've gone sky diving once. Would I then call my self a sky diver? Probably not! Whether or not I enjoyed the activity, I gave it a go, satisfied the curiosity, and am more fulfilled for it. It doesn't mean I need to reassess my identity.