TubeXO.com describes itself as the 'world's largest reserve of free porn'. I don't know how accurate this claim is, but I was certainly willing to put it to the test for the fine, loyal readers of My Gay Sites.
So what we have here is a general porn tube that has both straight and gay content. Note that the 'gay' category means that you can't filter the content any more, so if you want to see all of the gay Asian videos or gay gangbangs, you'll have to do without (it doesn't even appear to have a site search feature). There are currently just over 25,000 videos on TubeXO.com for you to watch.
The design is a little dated and filter refinement is only available for the most popular scenes. I didn't see any non-gay material in the gay niche though, so I guess that gives it a bit of an advantage over the alternatives near the bottom of my list of recommended gay tube sites.