How do you know your bi or ?

I am in a relationship. However I am not very ual. Maybe once a month and even that 1 time, its not because I want to but more for my boyfriend to shut up, lol. Now I do love him, with all my heart. I just seem to be disgusted by mens '. I think they are gross looking, lol. Even my relationship before my boyfriend now, I felt the same. Not very ual, etc. However, I am turned on by girls. I would never watch a regular but I would watch girl on girl. I have never been with a girl but have always wanted to. My boyfriend knows this. I am attracted to girls and sort or repulsed by men. Could I be gay? Or just curious? I'm confused. Why don't men turn me on?