It is interesting how the body adapts. Once a long time ago, I was with a man who was above average in penis size. My body took it in in all ways, and it was not a big deal. But then over the course of the last nine years ago or so, I was with penises average and below average. My body adjusted accordingly.
But what happens when you surprise your body with big again? You had the same one before, my body should take it all in. But sadly, it does not right away; it takes a little work, some miscomfort, and a little break. And of course multiple occasions to get back up to par. But what is there to not like about all that practice?