I use Spectrum Coconut Oil and it works great internally, but not so much on the walls of the anus, particularly the sides (no problem front and back) and toward the sphincter. It dries or gets pushed out by contractions, I don't know, but it dries way too quickly. And it's even quicker when I used a cushion on my lower back to free the K-tab. I do pre-lube the outside and push in small solid chunks of coconut oil into the rectum using the massager. Any advice on how to keep those side walls lubed?