Ahh, 4chan.org - the site that has literally defined a generation. If you're not familiar with this website, you're probably not using the Internet all that much. The good news is that today's the day that it all changes! 4chan has a dedicated section on its site that is located under the /hm/ URL - you'll find that HM stands for handsome men and well, it's where all of the gay anons head if they want to share pictures, GIFs, WebMs and other formats of pretty guys.
Threads range in content from sexual fantasies, young studs, meetup threads and pretty much everything in between. 4chan.org is entirely anonymous, so you can browse and engage in sharing content without an issue. The site's biggest selling point is the regular stream of new material (there are currently over 1 million posts) and the fact that you can submit your own ideas, thoughts and pictures if you want to. As far as gay image porn boards go, this one is pretty good and well, it defined the genre.