Just to toss out my 2 cents worth (if it is even worth that much... )

I think Dom/Sub tendencies are natural, either be it by raising, personality, etc. it is a role/position that feels most comfortable to a person. Basically their "natural" state.

I personally think that any time a Dom or Sub is considered "learned" meaning they don't have the natural tendencies but are taught that role in some fashion that is normally equates to Topping/Bottoming. Hubby and I are a primary example. I am sub, to my core, and yet I can and do manage things regularly, because I was taught that and because more importantly because I was taught the IMPORTANCE of the need to do be more forceful, leading, etc. at times. I do not feel that makes me a Dominate though because I actually despise on many levels the need to even function in that capacity. That makes me a Top at those times, at best. Just as hubby is sub (more so then I am normally) and although he may learn how to use a paddle, etc. he is only topping me at best, it is never in his nature or ability to truly Dominate me.

As to switches, I'm afraid I don't understand them very well either. I don't mean any offense to anyone, to each their own as long as they are happy but switches seem at times to be more of a vanilla couple with a kink or two thrown in depending on the mood.