Where i grew up...you just got into fights all the time, it was just taken for granted, small working class area with a lot of scumbaggy guys who think they are tough, you leave the house, chances are you will run into someone who doesn't like you, chances are you will get into a fight/get your ass kicked.
Same with primary and secondary school, secondary school especailly, because you had all these kids from the rough areas all coming together in the one place, and everyone had their rep to protect or make....fights, fights, fights, either you were in them or you were watching them, just a part of everyday life.
Later in life I was pretty amazed to come across people who had went through their whole childhood into adult life without ever being in a single fight, just mindblowing to me, fights were just like playing sports, going to the arcade, grabbing onto the small slits at the back of a buses engine and hanging on for a couple of miles for kicks....just something that naturally happened when you were growing up.
edit: and as for girls fighting, the ones i saw at school were pretty far from being 'hawt', lol, not like the ones in sit-coms, they could actually be far more distrubing, because the girls did not use their fists, they would really tear into each other's hair mainly, I recall one girl(who was generally held to be one of the best looking girls in our year, like the equivalent to the top cheerleader or something,lol), and by that end of that fight, it looked like half of her hair was on the ground, and you wonder if that was why they went for her hair.
I also saw sone pretty disturbing ones with guys as well though, especially when it gets to the point of stamping on a guy's head when he is on the ground.
but others, could just be daft as hell, two guys with big reps as fighters, everyone is hyped up for the fight, and then they end up fighting each other like they had never been in a fight in their lifes, not really making much solid contact, and chasing each other around.
but the ones that took place in the middle of the large grassy patches were the funniest, invariably that area would be peppered by Glasgow rain everyday, and both guys would be rolling around in the mud, slipping around, totally mockat.