I see this as a 'roles' issue for some. If you are accepting a 'submissive' role while 'en femme', then you are "flexible" on orientation.

If your inner image is a girl, and you get a case of 'helium heels' in that mode when presented with a big burly MALE who WANTS you.. then you ate NOT straight. I'm not going to make a claim on what you ARE, but it ISN'T straight.

Why get hung up on that? You like what you like. Why are you so worried about the label?

-MM