The best and most profound answer came from a girl I know who said, "I could've fallen in love with anyone. I just happened to fall in love with a woman first."
Not exactly that profound, as it doesn't deal with the question. Imo it side steps the issue. Does she mean that she could just as easily have fallen for a man. Could she fall for a man now if the current relationship comes to an end. Or has the fact she has fallen for a women made her honosexual?

Angelic woman are fickle creatures, i met one two weeks ago who was so interested in me it was scary. Made arangments to meet again, spent an hour or two in a pub, then back to her place. Bloody ex boyfriend turns up and i'm forced to leave via the back door, she phoned me this morning to ask if she can have some space to sort out her ex. I no a brush off when i get one lol.