Do lesbians ever like to hit on straight women?

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I'm straight, and have never been with a woman before. I have no idea if any female would even be attracted to me. But I had a weird interaction with a girl on the bus when I was in college. It was the same girl, and every day when she got on the bus, she would look at me- she never waved, or said hi or anything. She would just look at me. I don't know if she was a lesbian or what. I don't know if she thought I was pretty, or just somebody that reminded her of somebody she knew.. but it makes me wonder. Do lesbians typically know when another female is straight, and then don't bother "hitting" on them? Or do they ask? Or just jump in and hope for the best? LOL