Am I bi or gay?

From what you say (I'm still very attracted to women) you are bisexual. Presently you are more attracted to men, possibly because it is new to you. And there is less pressure on you to be with a man; you don't have to perform to satisfy your partner as you do with a woman. You are submissive and most comfortable in that role. On the spectrum you are bisexual tending toward the gay side.

Continued:
At some point in our adult lives we become more honest with ourselves about this issue, acknowledging that we really like anal stimulation. Based on our core beliefs we grudgingly identify ourselves as bisexual or gay, though we may or may not be. Those core beliefs generate this identity crisis. We all have certain conceptions of what "gay" and "bisexual" mean. Those conceived notions act as a template for our new ideas about ourselves then. In a sense they program us.

Ask yourself if you feel romantically attracted to men.
Are you aroused by the taboo feeling associated with your dick fetish?
Did any female ever tease you about liking it in the butt?
Does light humiliation of that sort turn you on at all?
Have you ever felt your penis size did not adequately satisfy a female lover?
Do you find comfort in having no performance anxiety in your role as a bottom with your man?
Does it make you feel feminine?
If so, does that turn you on or feel comfortable to you?
Are you turned on by hot sexy women? men?

There isn't a right answer here, and there is no score card where you tabulate yes or no answers and find a definition.

The answers to these and other questions may help you get a better handle on how you define yourself. I would not allow labels to determine my actions or my beliefs about myself. These labels are by their nature confining and insufficient to describe sexuality.
Understanding your feelings, examining your beliefs, and being honest with yourself can help resolve issues.
Best regards.

I don't find myself wanting a relationship with a man but sex only. The feeling of him fucking my ass is overwhelming and I can't get enough of it. The same goes for sucking on his cock and swallowing his cum. Sex with a woman has never been this satisfying!
Thanks for the input.
JJ

It sounds like you may be bisexual, as far as labels go.

Most of us learned certain attitudes and beliefs growing up about sex, e.g. we learned that anal stimulation was taboo, that those who enjoy it are gay, and that straight men are fully satisfied without anal stimulation. Until fairly recently most women wouldn't think of giving rim jobs to guys, or fingering their asses while blowing them.
The muscles and nerves of the anus work together with the muscles and nerves of the nuts and penis; notice how your asshole clenches up as your balls rise up in the sac when you cum? The prostate gland is located a couple inches in from the anal opening and is stimulated by anal penetration. Further up the rectum, penetration puts pressure on the base of the penis from within.
When we cum, the good feeling extends all the way back to the anus. So our physical experiences growing up were somewhat at odds with the attitudes and beliefs we learned about our "butt holes".
So many of us tried to ignore the pleasurable sensations we experienced in the taint and anal region, since according to the beliefs we learned, acknowledging those sensations as pleasurable might mean we were gay. I think that is how some guys begin to define themselves as gay, whether or not they are, and to suppress that idea.
Some of us are gay, but not necessarily all those who begin to fear they are gay due to the pleasurable sensations they feel in the anal region.

I would definitely lean towards bisexual. There is always a lot of discussion around top and bottom vs. sexual orientation.

I have met many bisexual men who prefer bottom in same sex encounters.

:)