Leviticus 15:5, 10-11

So if you touch the man’s bed, you must wash your clothes and bathe yourself in water, and you will remain unclean until evening.

If you touch anything that was under the man, you will be unclean until evening. You must wash your clothes and bathe yourself in water, and you will remain unclean until evening. If the man touches you without first rinsing his hands, you must wash your clothes and bathe yourself in water, and you will remain unclean until evening.