An Anime question that most likely has no answer?
How is it that when Happosai bathed Pantyhose Taro in the Niuhoomanmaorenniichuan,or the spring of drowned yeti holding an eel and crane riding an ox at Jusenkyo he didn’t get cursed as well?
Because Happosai made a deal with a demon for not being cursed he would turn into a female every full moon. 
Ranma 1/2 Character Profile: Pantyhose Taro
