I usually work out with my two 3" wide Dildo's that are 10" long. I always use anal ease, although I can take a 3 incher in my ass without it. I also have a Dragon Tongue that is made of a soft material that is 4 1/2" wide. I don't think it is 4 1/2" wide when it slips into my ass, though, because the softness of it actually gives a bit. I'd bet on 4", or even a tiny bit less than that. I have, once, managed to insert a 20 oz. pop bottle into my ass. For some reason, my ass felt as though it didn't want to stretch out enough to take the bottle, although it should have, with no problem. I'll try it again some time. So, for the record, I'd say I can take a 4" wide Dildo in my ass.
Oh, I almost forgot. I've got a cone-shaped Dildo that is 4" at the base, but even when I "bottom out" on it, I really wonder if I'm getting all of it. I've went back to the Bad Dragon website to try to buy another Dragon Tongue, but, because of the covid virus crap, they claim they are not making anything at this time, and a lot of the items I want are "sold out", or "out of stock". Do these things come from China?
How many others, like myself, need to wear a Diaper after a good fuck-session with their ass? I have to wear one for a few days.
On a Butt Plug note, I quite using them when I almost "lost" a 3" wide plug in my ass. The base part, which isn't supposed to go inside me, decided to do just that, after I inserted the plug and walked about 40' with it in my ass. I got really scared, because once the anal ease wore off, I might not be able to get it back out, and I really don't want to go to the hospital for that! I had to "cough" and grab at it to get it out. Never again. If I could find one with a very long base on it, something that couldn't slip inside me, I might use a plug again.......