Why do some girls only have male friends?

Speaking as a girl who has mainly male friends, I feel that I communicate better with guys. I'm not a super feminine girl. I talk sports, cars, politics, basically things that girls don't usually talk about. Some girls get along better with guys, and vice versa. I don't speak for all girls though. Some girls like to keep guys close to weigh out their options. I don't think that's right, but some girls are immoral like that.