In your experience are there any women just to small for anal? I’ve known some really petite girls (some not even 5′) but never got to try anal with them. What about large men/small women? Surely it becomes a stretch at times? Or any other ways that some just aren’t anatomically compatible?

Everyone is different, and an overall physical size difference can pose some challenges in some cases, but it’s not a totally limiting factor, nor is it the only factor. Some very small women can be extremely skilled at anal and some larger women can struggle with it. Pretty much anyone can get to the point where they can do and enjoy anal, it just might take a little more effort for some than others.