Well in my humble opinion if you can go both ways with anyone you're a switch.
I know when I identified as a sub it would have taken a special person to Domme me, from what I can see it's the same with all subs. As I said in another thread, I'd like to see some of the 'wannabee' Doms try it with one of my girls!
On the other hand I wouldn't be in the least interested in Domming just anyone.
I maintain it's a special relationship between two people, & there's essentially no such thing as a 'sub' or a 'Dom/me' when you get right down to it.
Tojo