My current girlfriend is cool with it, but she's absolutely fantastic about pretty much everything.

One of my exs on the other hand was a bit more aggressive and weird about it. She had a lot of toxic masculinity beliefs going on.

The real issue I have is that a lot of them think its hot, along with some of the other things I may have been into at one point. It's a bit of a struggle to explain that I'm not asking for more, I'm just being transparent to avoid a potential bombshell being dropped in the future. I don't have the energy for a polycule, to bother with a third, or anything in the lifestyle anymore.

If he's a hot twink, then yeah no that'd be fine with me. Perfectly understandable.

good news, those red flags are getting out of your way.

better them gone than polluting your potential partner pool.

I'm a woman who is straight AF, not a bicurious-bone in my body that I've discovered yet, and I'm having a casual fling with a bisexual dude. It doesn't bother me at all, he's hot as fuck, sweet as hell, we have a good time together, and I have better things to do with my life than sit around and brood about the gender of his previous partners.

Um, no. I am an old Xer lady and we know men can be bi too. And like the ladies... sexuality is on a continuum. Some people just love to canoodle with young beautiful bodies no matter what flavor... and as we get older, old beautiful kind considerate people.

If everyone just embraced being queer, everything would be ok. Sex and relationships can barely survive identity politics, old school or new.

I think the difference is the perceived energy barrier if one wanted to fool around on their partner if they a bi vs het.

A bi guy could, hypothetically, find a guy on grindr pretty much on a whim if he wanted to. This is a much lower barrier than straight guys face unless they seek a sex worker. If you are a woman in the early stages of dating someone, where you don't know yet how much you can trust a guy, if a guy tells you he is bi that can come off as a higher cheating risk than a straight guy.

Straight guys dating a bi-girl don't have a similar perceived risk increase. Early in the relationship, guys may not even see the potential of a bi-girl hooking up with a girl as 'cheating', vs a bonus for his enjoyment. But also - finding a new girl to date is considered harder than finding an interested guy. So the 'cheating' risk doesn't feel that much higher for guys dating a bi-girl compared to a straight girl; he may feel like he is still mostly competing against other guys.

Is this fair or even realistic? No, this is based on perceived stereotypes rather than the behaviors and character of individuals.

But this plays out at a stage of dating where people don't know each other well yet and are relying on heuristics.