Charming
There are two common explanations and one rare one.
Common explanation #1 - these are women (or men pretending to be women) lying about their experiences.
Common explanation #2 - These are women who've never actually measured a cock and have had a few above averages and assume, just because they looked really big, that they were 10+. I've been guilty of that. I thought one ex was around 9" though I never measured him and we never discussed it. In retrospect I now believe he was about 7" - 7.5". Which is still pretty big, it just doesn't sound it in comparison to a lot of the claims here. Another chap (fwb), from before Mr 7 of 9
, I remember as bigger than Mr 7 of 9 so I assumed that guy to have been 10" or 11". I now believe he's unlikely to have been much, if at all, over 8". I'm with the owner of an honest 8" now and though it's going on for 20 years since the big fwb I'm certain he was nowhere near 2" longer.
Anyway, less common explanation is that some women have just come up against (no pun intended) a statistical unlikelihood and really had more than one partner with an extremely large cock. But the chances are strongly in favour of one of the first two.
To the OP: Sorry to go off topic. I agree with those who say no pounding. If he wants to fuck hard and fast then you'll have to do it in a position where he can't get all the way in or where you control the depth.