turned on by lesbian porn

So i'm currently 19 years old and i've been dating my bf for a year now, in the beginning of the relationship we had sex multiple times a day every day & it was great! recently sex hasn't been enjoyable to me (nothing wrong with him but sex no matter what doesn't feel good ) i can only get off to lesbian porn and i am straight but i wouldn't turn down the opportunity to have sex with a girl if it was presented to me. does that make me bi or do other straight women feel like this?