Leviticus 15:18

If a man lies with a woman and has an emission of semen , both of them shall bathe themselves in water and be unclean until the evening .

When a man has sexual relations with a woman and there is an emission of semen, both of them must bathe with water, and they will be unclean till evening.

The woman also with whom man shall lie with seed of copulation, they shall both bathe themselves in water, and be unclean until the even.