If we are taking bath or ghusal and after finishing of it if hands touch with our private part intentionally or unintentionally then do we have to go for ablution again before pray. It seems un-practical as when we complete our bath and making dry our body with towel, our hands may touch with our private part. Sometime if we are in wudu, and we touch our part and see that there is no any drop of urine is present there. In this the wudu becomes invalid due to touching of the hands to the private part? Please respond with hadith reference.