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If I were to guess it would be a subconscious thing: Small women want to be with big guys because they feel more protected.
Even more primal: Your genetics differ greatly - you know... opposites attract? It's so your offspring have a greater chance of survival. That all goes pretty deep, but that's the gist of it.
I'm going with Charlie0 on this one. You being taller may be seen as a security blanket to the smaller sized women. They want to feel protected and even if it isn't true, height can be seen as a sign of power/strength/dominance... kind of like how animals stand up on their hind legs and stretch out when approached by a possible enemy.