FAKE!
There's no way this guy hasn't had sex with at least *one* of his cousins.
But on the off chance he's telling the truth... if he can really make thia video viral - and I've seen it mentioned elsewhere too, so he may well be on his way - then I can see a porn factory riding that wave and giving him 20K for a short clip. There are probably a few minor Youtube "stars" they could also convince and produce a compilation porn for LOLz and some quick cash.