Where would we be in this day and age if we didn't talk about xHamster? Home of what I would argue is the best collection of gay porn for all different types of users, xHamster provides a nice area where you'll be able to watch scenes that fall under the BDSM spectrum of entertainment. This free tube site also has a nice additional feature of allowing you to filter scenes based on whether or not they've available in high definition - a welcome addition when you're looking for free porn online!
Scenes here include ball busting, electric shocks, roleplay, fisting and chastity. If you feel like you have a particular interest in gay porn, feel free to use the search feature to find what it is you want too.
Oh, I also highly recommend the filtering choices based on rating. This will allow you to see the scenes that the community considers to be the cream of the crop. I don't know about you, but when I'm trying to bust a nut and I'm one handed, getting help finding content is an ideal step forward.