Int Porn is a huge porn forum that has been around for a very long time. It has tens of millions of posts across a huge number of themes and fetishes, but the section we're going to be taking a look at is the gay one. To date, there are just over 2 million posts here spread over 190,000 threads.
Thread titles range from 'young and beautiful twinks' through to 'hot gay boys fucking with shemale pornstars'. Every topic you could imagine has a thread somewhere, and I encourage you to use the search feature in order to get to the bottom of exactly what it is you want.
One of the drawbacks of IntPorn.com's gay forum is the fact that there are no sub-sections. You can't specify that you want to see BDSM or daddies in particular - instead, you're going to have to scope out the forums to come across the destinations that are relevant to what you want. It has a lot of porn, but it's just a shame the layout of the content isn't great.