This is interesting question posed, and I have come to several observations that SEEM to be holding up rather consistently. It seems that males are more prone to adapt female persona then the reverse. It seems also that in most of these cases there is no other reason to do so outside of sexual adventures. Discussing this with those that have admitted to such a thing, it seems there is a consistent aim, and that is to expereince women in a "raw, natural, and uninhibited" state of sexual arousal. This very desire seems compatible to "sexual male-ego" and organziation of "male sexual fantasy". That it could be used to discover our "female" side more deeply is probably true enough, though, I have not encountered another person yet that has admitted to such noble intent. :-) It would be interesting to hear colloborative or negating examples to these casual observations I have made. Interesting thread!