Ah, xTube! This is one of the most popular destinations on the Internet for those that want to find porn, and while it's a little focused on straight material, you can find gay clips if you know where to look. Furthermore, you can refine your search for homoerotic entertainment by clicking the link to see all of the twink scenes available. That's right - all of our dirty skinny boys getting fucked in front of the camera are right here for you to enjoy.
One thing to note is that a lot of the scenes on xTube are not found anywhere else on the web. All of the scenes are user-submitted, meaning you're going to be getting the cream of the crop when it comes to amateur pornography.
I should also note that after hitting the website, be sure to select 'I like males' to get the full range of twink videos. If you don't, you'll reduce your scene count from over 60,000 to just 150. That's not a good number at all if you want to see hot twinks fucking!