After masturbation my clothing becomes wet

After I masturbate, my bedclothes become wet, so I clean the wet spot with a cloth. I then wear another set of dry bedclothes. Is that new set I wear also impure because I am impure? If I have those clothes while in an impure condition, do I have to wash that set or may I leave them as it is, and can I consider them pure and not have to wash them?