This girl that I know is confusing me. She does not grow hair on her legs,underarms, or pubic area. This led me to believe that she has androgen insensitivity syndrome. But, she has a fraternal twin that is a guy. Wouldn't he have this condition? I understand that it is possible for this to happen to one of them but the chances are rare. She also has menstrual cycles. I don't believe that people with ais have menstrual cycles.