I'm sure that some are bisexual; some are undoubtedly straight women; some may even be lesbian. Do you have a source that suggests they're all bisexual? My understanding was that the "political lesbian" concept not only involves the belief that sexual orientation is chosen, but is specifically about being separate from men:

By definition lesbians cannot be ‘political lesbians’ and ‘political lesbians’ cannot be lesbians. The reason why the two terms exist is exactly because they are two different things that need to be differentiated. If a actual lesbian is a man hater, then she’s a lesbian that is man hater, not a political lesbian. A political lesbian is a non homosexual woman that use homosexual as a political statement, a separatist tool. They are not heterosexual, as you already acknowledged, a straight woman can be a 100% separatist feminist and not sleep with women, such women exist, and they are not political “lesbians” for choosing eternal celibacy or pretend to be asexual. Do not believe a heterosexual woman can be political lesbian. Straight women don’t fuck women. But I cannot show any prove of their sexual orientation, neither can you, so we better off sticking to material reality instead of “what if”.

Are all actually bisexual? Some are severely mentally ill straight women. Some forms of mental illness include symptoms such as lack of awareness of one's own bodily sensations-- a skill that's necessary for observing one's own signs of sexual attraction. It'd be hard to figure out the sexual orientation of those people, at all...

My last answer for your first concern can be applied to this as well.

I think there is some degree of reality to many stereotypes, and also a large degree of inaccuracy. It just depends on the stereotype. The only "political lesbian" I ever met in real life was a straight woman.

You met a political lesbian, anecdotal. It doesn’t take back that political lesbians are bisexual by default, if you use a bit of logic. Btw If she was engaging in homosexuality than your anecdote weight goes from 0 to -100 if she wasn’t engaging on homosexuality than how is she a ‘political lesbian’ and not simply a separatist feminist? I’m not a dumbass dormant or a mother despite being a woman, that doesn’t mean that women having the reputation of being dumbass dormants and be mothers, sometimes both, is inaccurate. A stereotype is a widely held, simplified, belief about a specific group, it is not a intrinsic rule for all.

Evidence?

For what exactly? I don’t need evidence for that. I personally don’t move on too fast, nor I am a serial monogamist, nor will I ever or have ever move in with a woman after just one year (or less) of relationship, none of these stereotypes apply to myself as a individual, but they apply to a large amount of lesbians otherwise they wouldn’t be stereotypes at all. My point was and still is, reputation and stereotypes do not come out of nowhere.

Probably not. From the US CDC National Intimate Partner and Sexual Violence Survey (2010): "There were no statistically significant differences between the prevalence of rape, physical violence, and/or stalking when comparing lesbian women and heterosexual women"

Yes, you’re right on this one, probably not but I can see it being probably yes, either way I’m not betting my head on that, hence the ‘probably’.

I don't really understand why you believe so many of these stereotypes about bisexuals OR lesbian women, lol. Like, have you met people IRL who fulfill these stereotypes, or what?

You can’t understand why I think the way I do if you use different metrics to think than I do. You seemly to not even come to term on what is a heterosexual women or a lesbian, for the sake of appearing partial. No offense but a people pleaser not understanding me isn’t really surprising, I don’t understand you either so I think we’re even on that.

I have never met a single woman to fit in all the stereotypes about lesbians at once, but yes I have met lesbians that fit in stereotypes. As for bisexuals.. I have met many bisexuals, far majority at some point or another lay in the bed they made for themselves. This is not to say every single bisexuals are X and deserve z, y, w reputation but that the reputation bisexuals have do reflect reality and those of them that do not fit in on the stereotypes, despite not be responsible for the stereotypes, have no leg to stand on being scandalized surprided pikachu face for stereotypes about them existing as if never in human history a bisexual have done what bisexuals are accused of doing/being. One can fight stereotypes without pretending they come out of nowhere, no need to lies or gaslighting.