If a man has any kind of bodily discharge, he and everything he touches is unclean. Anyone who touches anything the dirty man has touched needs to wash their clothes and take a bath and they’ll only be unclean until the evening. When the discharge clears up, the man will wait seven days and then wash his clothes and take a bath, and then offer some sacrifices to God.
If a man has an emission of semen, he needs to take a bath and also wash anything the semen touches. If he’s with a woman and it happens, they both need to bathe.
If a woman is on her period, she will be in her “menstrual impurity” for seven days. Anything she touches during that time becomes unclean. And if she has sex with a man and he gets blood on him, he’ll be unclean for seven days.