Unfortunately, I have

When I was with my ex sex was always pretty good, if not as often as I'd like. However a couple of years ago I lost a significant amount of weight, and I guess with the fat pad diminishing, I gained just under an inch in length, and my ex told me I felt thicker as well. (although that either had to be his imagination, or just improved blood flow rather than any real growth) Unfortunately sex became a lot more uncomfortable for him, I did my best to not go deep, but I was rather used to slamming all the way in and never really having to worry about that. That wasn't a big part of why we broke up, but it factored.
I've not really had a lot of complaints since, but I've also learned to be far more careful. (also, amusingly enough, since our break-up he still regularly tries to get ex-sex... now that we're not together anymore he loves it being bigger)