GayForIt.eu is an adult tube site that, as the name probably already lets you work out, is all about the world of hot gay fucking and sucking. Note that while it does have a .eu URL, they have content from all over the world and it really doesn't mean much at all.
So the black section on Gay For It contains thousands of videos - while it doesn't have its own specific category, the link I've provided you with will show you all of the search results when you type in 'black'. Once here, you can filter the content further by date added, view count, length and rating. My personal opinion is that the best way to go for all porn video searches is to sort by rating. This way, you can see what others consider to be the cream of the crop.
The site has a nice design with a black color scheme. This is great for when you want to watch gay porn at night without being blinded. Thumbs up to the team at Gay For It - it's a top tube that you'll love jerking off to!