In relationships there must be a size difference.
I admit I'm into the whole dom/sub thing, and when I go for a partner, I can't find them attractive unless they're a lot smaller, or a lot physically bigger then me. I'm talking over 6'6 here, or under 5'. For boys and girls, I'm a chick but I'm bisexual. I've never had a relationship that has lasted over a month because of this reason. IIN?