Only tried it once when I was alot younger and pretty naive. It only seemed natural to use what was available as lube, which would be soap. It's slippery. It seemed to make sense, lol. Apparently, it starts to burn. Needless to say, we needed to stop and get him well rinsed. We ended up doing it with him propped up on the bathroom sink instead, lol. Anyway, it was great while it lasted. Would love to try it again.