For straight guys, IMHO there is a connection between this fetish and a strong, competitive perhaps combative woman in your past -- most likely your very early years. Could be an aunt, a sister, but most likely Mom. I'm no social scientist by any means, but over the years I've read lots and lots of posts, and it seems to me that guys who are into this have this characteristic in common. That was a good enough explanation for me, and I've found considerable peace in this rationalization.
Also, we seem to have amazing memories. I doubt that this is connected in some way, but it certainly appears to be true.
As far as the type of competition that one prefers, well that my well have to do with the kind of relationship that you had with that woman.