<human>: I've asked in /r/Bisexual as well...figured I shouldn't limit my potential responses to a particular demographic. But of course, they would be able to offer insight as well.

She knows I'm Bi and that I've been with a man before. I know that it's normal to sometimes fantasise exclusively about men.

I just want to know, in a steady monogamous relationship, where all of this essentially amounts to head-porn; would you bother having this conversation with your girlfriend, or simply avoid it and leave things be?

I don't want her to think there is some purpose to this, it's just something that happens to me. In my head, this only ends up  blowing out of proportion. We've joked about threesomes and stuff but I'm not really looking for anything of the sort, I'm very happy with just her. 

How would you go about it? Would you at all?

Can you provide a brief rundown of the text in within 3 sentences?
<bot>: Bi guy thinking Bi things, how do I ensure my gf knows I'm just talking casually about it, if I tell her what I'm thinking.