I know it's popular to have a slightly feminist view as a man, saying it's really our fault because we say the average is between 7 and 9 but I would think the women have a part to play in it too by continuing the belief.
If women had a play in this, then exaggerated penis sizes wouldn't be found in gay dating or porn.
I can guarantee that every gay male on dating sites lies about their penis size, as otherwise 8+ Inch is the most common penis size in the world.
I remember when I once created a profile and listed my size as 'small', which I guess is also lying as the truth would actually be 'micro', but that wasn't an option. Many men commented that it was the first / only profile they had seen that actually listed 'small' as the penis size.
The most typical thing I see today is men with barely anymore than a 4-5 inch erect Penis advertising themselves as 'hung / massive' penis. For whatever reason both gay men and straight women continue feeding this grand delusional fantasy that most men have about their otherwise inferior penises.