Ok, here's my rather scientific two cents. Women enjoy watching other women- from checking out someone's hair style to watching a woman get off, it's not about liking that woman or being aroused by her. Rather, it is putting yourself in her position. Perhaps the reason that you are aroused by gay/bi porn has more to do with you empathizing with the actors than about being turned on by them. Just a thought
Kate

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I am certain of nothing but the holiness of the heart's affections and the truth of imagination. What the imagination seizes as beauty must be truth - whether it existed before or not.
-John Keats