Well, I'm not very experienced, but so far, my ONLY practice has been switching with the same person. I had no problems with this, but I have a very strong need for balance AND a very high tolerance for ambiguity/paradox. There was one night when I went to bed after a very heated (sexually, not angrily) phone call, and imagined myself as both all night long, simultaneously.

So, that's my preference. There's something about the challenge itself in maintaining both roles with the same person that excites me. As well as the occasional skirmishes for dominance at a particular time/place.

I think there's a part of me that can't fully respect/give to someone who hasn't done the same for me. Being dominant without being dominated is a little easier, but eventually, I think I'd end up feeling guilty -- even *knowing* they liked/preferred it that way. And I've got a few fantasies that I'd miss experiencing.