Have you ever gone to the supermarket to buy something and done the whole 'self-service' thing? Of course you have. Anyway, from that completely unrelated question, I'm going to jump straight in and talk to you about /r/SelfService, a subreddit that looks to promote 'pics and videos self-love'. That's right: dudes with dicks that are all about playing with themselves until they bust a nut that they can share with the world on Reddit.
The subreddit currently has 7,000 subscribers and as far as I'm concerned, it's one of the better places to find amateur content. I'd say around 90% of the content is self-submitted, which means that it's the dudes with the dicks that choose to put this stuff online. Naturally, you're encouraged to comment and let them know how much you appreciate the jerking.
The content is around 50% images/GIFs and 50% videos. It's not all gay, but I think plenty of dudes here aren't too fussed about us bros enjoying their self-pleasuring sessions.