Anyone else think this?

Ok so me and my girlfriend have been dating for almost two years now and our relationship is getting serious but i'm always having this curiousity feeling on what it would be like to be with a guy. the only people i've ever dated are girls, and there is no way in hell i'm cheating on her. so i was just wondering if anyone else thought that my curiousity would pose a problem later and if so what should i do about it?