It’s always a good idea to have a few female friends. They can give you great insight on the female condition. Well, they’ll be much more valuable references than your drunk buddy that hasn’t had a date in three years. As a matter of fact, any average guy should have at least a handful of female friends. You’re grown up. This isn’t second grade where the girls are icky. Normal social development would dictate that establishing friendships with the opposite sex as well as your own shows that you, well, aren’t some wacko. But, all of that aside, here are three types of girls you should never be friends with… but probably are.