I'm bisexual but haven't been intimate with a woman...
And before anyone says "then how can you be bisexual?" - how did you know you were heterosexual when you were a virgin? It's about sexual attraction and/or love, not sexual experience. I chose not to because I first realised it 26 years ago, when it was a bit less "acceptable" and I was scared of the implications so it was easier to stay only involved with men at the time, and now I'm married and monogamous...
Plus, while I had women make advances towards me, men were much more frequently persuing me so it just ended up being pretty easy to pretend not to acknowledge it.
And that's my point OP. You don't need a sexual experience to acknowledge your sexuality. You just need to acknowledge your true feelings.
If you are in a committed relationship and not polyamorous, then male or female, it's still cheating.
I'm quite aware of my sexuality (actually for clarity's sake you might go so far as to call me pansexual as I've occasionally been attracted to non-gender-conforming individuals in the past - although it's mainly men and very feminine women who really catch my attention).
If you were single, I'd say don't just "try it out" either. Many gay or bi women don't want to be someone's experiment. Wait for someone who you have true feelings about.
You will know if you're bisexual or not, simply from whether or not you've been turned on by, had a crush on, or fallen in love with women.
My first woman crush was a teacher when I was 13 (I still remember her curly hair), and I've had at least 4 other significant female crushes, besides plenty of passing attractions to people in the street or in the public eye - Rihanna being one beautiful sexy example - and fallen in love with 1 woman (who remains a long term friend and is now also married with kids these days). I always seemed to befriend women who turned out to be bisexual too. Like we had a "radar" (or gaydar lol)...
If any of this sounds familiar, then congrats my friend, and welcome to the club.

