I've no idea who 'Big Alan' is, but I guess he's put that moniker to the test.
That said, it's a penis – half the population have one, and the other half have probably seen one, I'm never sure why we get so het up over such small things.
It could be worse, when I lived in the US a local school teacher inadvertently sent a picture of himself naked to his entire K12 class, rather than the appropriately adult woman he'd intended. I doubt even the US being a nation of moral prudes made it any worse.