Ranma ½ is a Japanese manga series written and illustrated by Rumiko Takahashi with an anime adaptation. The story revolves around a 16-year old boy named Ranma Saotome who was trained from early childhood in martial arts. As a result of an accident during a training journey, he is cursed to become a girl when splashed with cold water, but hot water will change him back into a boy.
If you havn't seen Ranma 1/2 then start now! This was and still is one of the best anime series I've ever seen. The animation is not the best but the story and dialogue are hilarious! Ranma mixes martial arts and comidy with just the right amout of sexual content.