Attn: This Is What Actually Determines Penis Size
Look, as interesting as this article is, I'm a big fan of Dan Savage's philosophy about dick size: Rock what you've got and, if you're still worried about the dick in question being too small, how big is their tongue? How big is their forearm? What kind of toys can they play with?
Penis size is not that big of a deal.
It's just not.
There are so many different ways to have great and awesome sex and only a fraction even involve a penis; if that fraction is the only kind of sex that you're having...that seems like the bigger problem.
Luckily, it's also an easily solved one.