As long as I've known about BDS&M (which is about as long as I've known about sex), I've known I'm a switch. I think I'm a switch with Domme tendencies, in that I realized my thing is in part based on controling others by meeting their needs, so even when I'm subbing I'm looking out for numero uno, which probably makes me a bad sub to the pure 'Master First!' crowd, but works out okay as far as day to day relations. In mating I look for an anvil to my hammer, which is to say I want my male equal in switchery.
The disadvantage is that I tend to find relationships with pure subs or pure Doms awkward, as I find the former fires my protective instincts and makes it hard to play the cruel games I like, and the latter orientation brings out the sadistic desire to take them down a peg or two, which I know is rationally not ethical.