"Why don't lesbians get to be bi-curious?" Because this really stretches the term 'lesbian', and 'homosexual', until it means nothing anymore. Being bi-curious means you're in a state of questioning; it means your sexual orientation is in limbo. It implies that someone either doesn't understand sexual attraction yet (like kids/teens for example) or that you thought you had your sexual attraction figured out until you found someone attractive whose sex isn't included within this definition, which simply means you used the wrong label/term to describe your feelings until now. Happens to the best.

But you're not a lesbian AND bi-curious. Just like you can't be straight and bi-curious. If someone is really comfortable sexually experimenting with either sex, then this person isn't homo- nor heterosexual.

The problem here is that this woman and maybe you are using 'lesbian' or sexual orientation in general as an identity, and not just a term to describe homosexual women and sexual attraction. And that's straight out of the TRA textbook and queer theory 101. And if you do that, then 'lesbian', 'gay' and 'homosexual' have no sexuality-related meaning at all. What's left is stereotypes.

If a woman, an adult human female, is attracted to a man, then this woman is factually not homosexual. Homosexuality, being attracted to the same sex, is not the right descriptor for the sexual orientation of this particular woman. The question everyone should ask is why she clings to the identity "lesbian"? Why not embrace bisexuality? If society just accepts this kind of entitlement to words because of the "be kind" narrative, what does it mean for lesbians who do not feel the same way as her? Because now we can't actually distinguish anymore between women who are only attracted to women, and women who are attracted to both sexes. What does this accomplish? We will just end up in a society in which homosexual women can't organize or even define themselves anymore. Homosexuals then cease to exist. Among the TRA kind, we're already just "people with a preference". It's Orwellian.

There's nothing wrong with being bi or straight. This woman can still live and identify with all the lesbian stereotypes that she chooses. It doesn't change the meaning of the word homosexual, and it therefore doesn't make her a lesbian.