Bisexuality Support Group
Bisexuality is a sexual orientation which refers to the aesthetic, romantic, and/or sexual attraction of individuals to other individuals of both their own and the opposite gender or sex. Most bisexuals are not equally attracted to men and women, and may even shift between states of finding either sex exclusively attractive over the course of time.
What I find important from your brief comment is to know if what you are seeking is the fulfillment of a fantasy or something that will lead you to know if you prefer male/male sex over male/female sex but the only way to know is to experience both and see if you have a preference or that either gender is (mutually) pleasurable. There is so much stigma attached to the label of "gay" that people have a hard time wrapping their heads around the stereotypes enough to know that it's merely a form of sexual enjoyment, which is a biological need, and no need for guilt or shame.
I guess you can call me "bi" because I am married but I do prefer sex with men and have been sexually active in gay roles since I was around 10 years of age. My advice is that when and if the time comes to explore your "fantasy?" that you are in a safe and sane environment with a safe and sane person. I've had some really awkward experiences with both male and female partners.
Don't stress too much on the labels. Look to find your own pleasure and then you'll know more about your identity as "gay," "straight" or "bi."
The "right" situation will come at the right time. Time now for a deep breath.