I'm looking for my complement - a woman that fits into me like a puzzle piece. A woman that would seek to build me up through her service, just as much as I'd love to build her up through my dominance.
What makes a good sub? Her character, mostly. Sure, I want someone who is pleasing to the eyes, but loyalty, accountability, humility, respect, intelligence, and ethics matter more.
For me: I have enough experience to know to take things slow, just as one would with a vanilla relationship.