For what it's worth, I've been squatting since preadolescence. As a counterpoint to the experience of the sitters in the study who rated their experiences squatting "more comfortable" than sitting, I've tried going back to sitting from time to time to no avail; I find it unnatural and difficult.

I always figured it was because I was used to doing it my way, not because it was easier. I didn't switch for comfort reasons, and certainly I never dreamed it might prevent hemorrhoids later in life!