I don't even mention numbers when talking about size anymore for reasons like this very video. That one blonde girl Val Dodds at 2:17 just referred to "like 7 or 9" as "regular sized" and many others are obviously exaggerating. A lot of people never even bother with a ruler and use whatever they hear someone else say, or get told, as a guide.
I'm not small, but I'm definitely no record setter or anything and I've had more than a few girls guess me at 9-10, which are serious over-estimations.
I remember working in a store when a woman came in looking for stick candles asking if we had any that were 12 inches in length... as she held her hands barely 6 inches apart. I bet her boyfriend fucking adored her.