All this is very hot, but as one of the posters said, it can go south very quickly. Exactly. I've had anal go south very quickly several times before. That's why I strongly prefer small dicks in anal.
The kind of woman who can take big dicks at short notice with minimal prep, has probably spent hundreds of hours training her butt to take big dicks. That's really a waste of time in my eyes. You seriously do not need a big dick to have very intense and exciting anal sex.
To each their own right - I prefer them bigger, 7+ but I like it all. And I do train for the big cocks because I get them often and I don't want to shut someone down because I'm too tight.