It's complex! I call myself a lesbian because it's the most accurate descriptive term I can find, and it conveys useful and true information - I have zero desire to engage in sexual activity with a man, and lots to do so with women.

And yet there are many men I find attractive, just not in manner that inspires the slightest urge to do anything about it, unlike women. But I still find them attractive? So I can see how some people might consider that bi. My brain hurts, sexuality is complex, and our language for it is too simple.