After several partners as a submissive, I turned switch with my current partner, and we have been monogamous for well over a year now. Sometimes I am more Domme than sub, other times we can switch easily in the same session. I can't say what it would be like to sub to one partner and Domme another because I've never tried it - but I understand that it can work quite well if the power exchange is what really drives your switchyness (is that a word?)
miss_sweetpea