I have a question about my cat.?

Its fine i have 3 cats. Two of my cats are very sweet and rub on you all the time. But the other one, she is a girl,rubs on me all the time when no one else is in the room. But when someone else comes in she bites me. I think she just likes to play around. Also your cat may bite you or other people because you touch her stomach. Most cats like it but others hate it. So there is nothing wrong with your cat. Hope this helped:)