I think that there are probably not any clear lines in sexuality. I think sexual orientation is pretty tricky. We all hear about guys in prison ( or at least we saw Oz), who insists they are not gay, but have homosexual lovers. I think Kinsey found many experiment with same sex relationships in their youth. Now, with women I think the lines are especially tricky for many reasons. We are more physically affectionate with each other, often much more emotionally close/intwined each other. Honeypot is right when she says that many women find looking at women sexy, and have fantasies. One of the hosts of the View said that she did not think of herself as bi or gay and she would "date" Angelina Jolie. I am not sure about clues. What happens when you ask her? If she has those leanings, what would keep her from telling you? How goes it bolete?
Arguing with reality is like trying to teach a cat to bark—hopeless. (Byron Katie)