I looked around on YOBT.com to try and find a reason for the site's title, but to be honest with you, I don't think it actually functions as an initialism for anything. YOBT is a tube with lots of straight content, but it also has a dedicated gay category that's going to show you the guy on guy material they have. Sadly, there are no sub-categories for the gay material, which means you're going to be stuck with using the search function if you have a specific requirement.
The gay category has a lot of material in it, although sadly, I did see one or two transsexual clips. I don't think people really understand that most gay bros aren't interested in seeing chicks with dicks. The problem is really limited, but it's still not ideal.
You can't filter the content by rating, upload date, scene length or number of comments. Hopefully these features will be added in at a later stage to make using the site a little better.