I know what you mean. A very long time ago, we're talking many decades here, I had this one submissive woman forewarn me that she had a pretty tough ass, when it came to receiving OTK bare handed spankings on her naked ass. I found out she wasn't kidding either, because my hand felt it more than her ass did. I quickly resolved that little problem though, when I switched to using a paddle for general punishments and then, a leather belt for more serious ones.