Quite honestly, when I was young, I thought I was in a small minority of guys who loved a physical battle between two girls. I'm in my sixties now and have been turned on by catfights since before puberty. I certainly didn't dare talk about it back then. The arousal I feel watching girls fight is as strong today as back in my younger years. Obviously, in the 70's when wrestling magazines like Sports Review Wrestling and Wrestling Revue would feature girl fights in apartments or in the ring, it's because there was a market for it, and both these magazines contained ads on how to get more girl-fight material. So, I knew I wasn't alone. The dawn of the internet has proven that there are lots of guys that are turned on by this. What's the percentage? It's hard to say as I never discuss it out in the open.
The more important question, I think, is the level of intensity. Some guys enjoy watching girl fights not necessarily as a first choice, but more like a side project, while others, like myself, consider it the primary source of sexual gratification. I am sometimes totally consumed by catfights. The percentage of guys who can claim this as their number one source of sexual excitation is probably low.
Today, I still love the fantasy of the catfight I had growing up. It's always two gorgeous busty girls fighting topless (Goldie Blair type girls), wearing nothing but either a bikini bottom or short shorts, and high heels that stay on throughout the fight (nothing sexier for me than beautiful legs in heels). The fight always ends with a winner and several victory poses from different angles and positions. I don't care for sexfights, it's catfights that arouse me, the physical struggle for supremacy between two beautiful girls. I will add that I prefer staged fights (with realistic acting) knowing that nobody really gets hurt. Part of the fantasy of a good staged fight is that it doesn't look staged.