I'm not sure what is meant by 'letting the implement slide', or why that would make a stroke hurt more - if it slid sideways on impact, wouldn't that deflect part of the force of the blow? Also, I'd've thought that it would be
less likely to slide over fabric, rather than smooth skin. However, I've heard that tight panties can make an implement spanking worse, as the bottom is unable to flatten out on impact, which normally absorbs some of the energy of the stroke. And of course there's the argument that spankers spank
harder on panties to overcome the percieved protection panties offer, and because they can't see the reddening or marking of the bottom. Really, we're doing them a favour by taking their panties down and punishing them on the bare....!
