It does not matter whether it continues to flow out of his body or is blocked. It will make him “unclean.” Here is how his liquid body waste will make him “unclean.”
You committed shameful acts with the people of Egypt. They were your neighbors who were ready to have sex with you. You offered yourself to them again and again. That made me very angry.
There she had longed for her lovers. Their private parts seemed as big as those of donkeys. And their flow of semen appeared to be as much as that of horses.