I have four females, and I wanted females specifically because I did not want to deal with huge testicles, buck grease, and penis plugs.
One of my girls doesn't really like to be touched, but she is still friendly and always wants to come out of the cage. She will crawl on my lap and play with me, she just doesn't like being petted and hates being picked up. My oldest girl is super sweet and snugly and always has been. My "twins" that I got from the same litter are hyper busy little girls, but still love to be cuddled and petted when they are in a calm mood. They all greet me, give me kisses, and want to play with me any chance they get. :heart:
Like everyone else said, all rats have different personalities, and spaying/neutering will help to chill them out. Fighting happens, but usually it's more like little arguments, not vicious fights.