What is leather butt?
Leather butt is a term used to describe the condition where prolonged and repeated paddling or striking of the bottom leaves deep bruising which, over time, makes the ass less sensitive. If it is done repeatedly over a period of time without a break it has been rumoured to be permanent, even after a break period where no impact occurs. However, I myself have never met anyone who had permanent leather butt and a break from striking that area usually brings back the sensitivity.