Are you considered bisexual if you're a lady who dates guys, but is sexually attracted to woman, and you'd have sex with one?

Someone said if you were sexually attracted to both sexes, but you didn't necessarily want to date one (like in a long term relationship), that wasn't considered bisexual. I think they said it was bi-curious. But that sounded a little weird to me? Because isn't your sexuality defined by who you have sex with?? Sorry if this is a stupid question.

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