A fapkin is a a napkin poor people (who cannot afford normal tissues) use to fap. Most fapkins are known to leave rashes and in some cases herpes. The herpes usually comes from factory workers who "fap n' pack" or use the cheap fapkins and replace them into their packaging.
The rough dry surface of fapkins usually gives me a rash upon use. Instead of lotion i use water and if im lucky i might find some tree sap. Im a lucky one. I have not contracted any STDs from my cronic fapping.