The average dick size in the UK is 5.5 inches and some parts of Asia have staggeringly small averages. Anything over 7 inches is pretty damn big and puts you in a very lucky minority, so a WG is obviously going to mention it, any good WG is going to recognise the need to build a sense of mutual attraction.
I was shagging a WG recently, she was a very attractive size 6. She happen to mention she doesn't like big cocks they hurt her, I told her she was in luck then. When I got her draws off I could see what she meant, she had the smallest little slit I've ever seen! And she was very naturally tight! But no I've never had a prossie say to me "how big are you" because I'm not!
I remember when I was a young man always wishing I was 1 or 2 inches bigger, but these days I'm very happy and thankful I have an average size penis which I have a lot of fun with. And have never had any complaints. Out of the 100s I've shagged I could count on one hand vaginas that have been too loose for me. Also I could count on the other hand the amount of extremely tight pussys I've had. On the (w)hole though
my average size penis is generally adequate, and I guess I'm lucky it still works for now. Which is the main thing.