Does it affect your relationships that you think about sex with the other gender? To the point where you don’t want to be with that person anymore? Or you feel guilty like you’re cheating on them?
I don’t think it’s necessarily a BAD thing that you have a crossover. We all have fantasies. Besides, you enjoy sex with both genders. So maybe it’s a masculine energy that comes out when you’re having sex with guys and a feminine energy that comes out with girls. You seem to be switching roles in terms of domination or really just “who’s on top”. It simply manifests in those kinds of sexual thoughts. Here’s the hard question: Do you just THINK about having sex with a guy when you’re with a girl or do you WANT to have sex with another guy?
You say you’re enjoying it, so what’s the problem? Maybe it’s just a turn on for you to think about guys when you’re with a girl and vice versa? The only time a problem comes in is if you actually WANT to have sex with someone other than the person you’re with. Thinking/fantasizing is one thing, actually wanting to follow through with it is another. Also, are you thinking about specific people in your life when you do it? Ie. Do you think about your ex girlfriend when you’re with your current boyfriend? That would be problematic.
A vague idea of men/women or celebrities or the girl you saw in the coffee shop yesterday is very different than fantasizing about sex with people you’re close to or were close to. It turns into an emotional connect and not a physical connect.
Do you truly feel like you’re not fully satisfied or are you assuming that there must be something wrong because you think this way?