7. Instant social proof
Consider this from a woman’s point of view, if she sees a guy standing there in the bar all alone, she might think he is some sort of creep. But if she sees you with another girl and having some fun and laughter, she will think you are a nice guy. I mean why else would another girl be with you? This is what a female friend can give you. When your friend is around, other girls will think of you safer and be more open to you approaching her. In short, girls make the best wingman.