The anus is usually an exit only area so when we're putting these in it you know we're getting the the anus has a shitty day job. You want to start really small i think butt plugs that have a flared base a flexible neck and a curved really soft kind of top are super important and helpful. Something that's no bigger than your thumb that's where you should start with with anal training. Do not skimp on the lube for any kind of anal play don't go too big because once your poop is in the rectum you're already sat on the toilet.