While Hard Sex Tube isn't a website that is 100% focused on showing you videos of gay guys going at it, they do have a specific category where you can check out videos of boys being boys and fucking one another. The site overall has 1.8 million videos - I don't know how many are devoted to gay content, but from my calculations, you're not going to run out any time soon.
The display of the material here isn't ideal, but it does have the ability for you to see which categories are the most popular. Seems like guys are into amateurs, Asians and twinks - who would have thought it?
Anyway, I don't know what else to say about Hard Sex Tube. It has some pretty decent porn and if you need a nice purple-themed pornographic video streaming service, look no further than right here!