I don't know. I think some young males might not be sort of shy when it comes to punishment size. There's no shortage of posts on the internet or media stereotypes about size. And of course porn has a size bias too. It seems that some women want their man to stay private because they want the social approval of their friends group, which tends to place value on large members.

Obviously this doesn't apply to everyone, but I do think it's a non trivial number. Maybe it's a vicious cycle and more exposure of normal sizes would help normalize expectations/views.