With respect to male/female subs and why they seem to build different relations to a Dom/me, I think this has something to do with physical strength, cos most women have this deep-down awareness (though you don't want to talk about it too openly) that men are very often physically stronger. In another thread a Dominant woman wrote not long ago about how her male slave had lost the feeling for subbing and serving - "when I pull his hair or act in a tough way he just pushes ,me off and tells me he doesn't want to be Dommed now". It's hard to imagine that situation with a male Dom and a woman sub isn't it? It's a consensual relation yes, but the difference in strength sort of cements the fact that the female slave can't just easily kick off her submission from one day to the next, and this means that, since the submission of her body is granted and can't be shaken off easily, mental and sexual submission come to the fore.