Ranma ½

Ranma 1/2 is an anime about a boy named Ranma Saotome (早乙女 乱馬) who was trained from early childhood to age 16 in the martial arts. There are four women who want to marry him, three of whom claim to be his fiancee. On top of that, he has a curse which changes him to female when he comes into contact with cold water. Hot water turns him male again. Very weird.