I am not surprised.

The narrative that women are less homophobic than men never made any sense to me, because why would they?

That claim always - to me - seemed to be stereotyping women into sacred princesses who shit rainbows and fart breeze.

When I was at my university’s last year I had a FWB relation with a woman from my class.

One day I was venting about my lack of success on online dating apps and asked her to review my profile.

After reviewing it she said “You should remove that you’re bi, it is not serious”, like I wasn’t looking for a proper relationship.

I had it in my profile for starters after people matching with me and later rejecting when they learned I was Bi.

I think one of the contributing factors must be the deeply ingrained traditional relationship roles reinforced by culture.

Men often care more about "proxy" contacts (i.e. "my girl fucked with another man some time in the past, ew"), which is how we got so much virginity culture and all the unscientific bullshit around past contacts of women. They are also often easier to feel sexual about any given woman, and many want, secretly or openly, to have sex with many, either genuinely or as an internalized proof of superior masculinity.

Combine the two and you may get one of the answers. Some men enjoy having sex with their girl partner knowing she had engaged in it with other girls, that fuels their fantasies based on that "proxy sex" with other women, and there may also be fantasies about this arrangement turning into threesome.

At the same time, women are traditionally taught to laser-focus on a partner and keep them laser-focused on them, and so bisexuality feels like a man's excuse to slip from these norms and claim it's not the same. It's also fueled by misconception that bisexual people necessarily need partners of both genders at the same time instead of them just having a larger pool to choose from.

am a straight cis old guy, gf is bi (she had a gf before me). I've encouraged her to go explore with other women but she said no, we have together in the past but I said by herself is ok with me. I'm old enough now that I don't want her going to her grave wishing she had. She has a few gay friends and said shes never had any issues letting them know she's bi.

I'd also be happy to explore a poly relationship but that does seem like a lot of work :)

While it says only Britons participated in the online poll, IIRC this trend persists in the US. That said, It’s frustrated by recent alignment of social cleavages through extreme cultural polarization on top of the ongoing crisis of sexual violence by straight men. The favored explanation I recall pertained to fear of STIs and bisexual men being presumed gay in straight culture, but that may be an obsolete theory today.

Personally I had good experiences dating bisexual men, but I was never straight

People saying it's some male fetish thing also fall for the "girls and boys are entirely new species" idea a bit.

Women are people too. Women make up 47% of gay porn watchers. It's normal.

Real reason is likely something else. Should probably ask cis, hetero women instead of speculating.

I remember when I was a teen trying to figure myself out I came out to my parents as gay and they were supportive. But eventually I had a couple of girlfriends and after I had brought one of them home mom told me I should pick one team and stick with it because bi guys are icky.

She said it in such an offhand way that she probably doesn't remember, but that's the kind of thing that sticks with you. She believed that bisexual men were willing to fuck anything without standards which would lead to me being either deranged or diseased.

Joke's on her though: I'm so bad at picking teams I didn't even grow up to be a man

I’ve observed this in some women’s groups over time - this aversion to bisexual men - and it’s always so disappointing to see it come up. There are women I’ve had to pull away from because of these views that bisexual men are somehow tainted or too feminine or whatever flavor of homophobic reasons they use to reject people based on an immutable trait.

Any bisexual man knows this. Painfully.

I never understood the bi hate. Even before I ever met a bi person, it seemed easy to understand - they're sexually attracted to either gender. Whether or not someone is a cheater type is completely separate and has nothing to do with it.

Bi people are some of the coolest people I know. Their loss, more for us.

Straight guy here from /all. Unfortunately, a big chunk of my cohort will have responded favorably because they are dreaming of a female partner that will gift them a threesome.

I'm a straight woman who very briefly dated a bi guy. I never cared. It felt like none of my business who he had been with before me. He was an absolute sweetheart, and I miss him dearly.

I thought the whole point of this last decade+ is that people should take what they can get.

Oh wait, I forgot about the homophobic propaganda.

This is especially interesting when you consider that a lot of people are on the bi spectrum. Straights who think gays can "choose" to be straight? Mkay, keep telling us how you're choosing to ignore that your gay desires.