Submitted: Jul 5, 2008 - Whether they hear about it on the playground or in the soda shop after school, your kids are going to learn about people who have sex in exchange for gasoline and/or pre-paid gas cards. They're bound to be curious about sex-for-gas activity, and maybe they'll even feel peer pressure to have gas-sex before they might be ready. No matter how hard you try you just can't protect your kids from the…