/r/NSFWHardcore is a subreddit devoted to hardcore sex. There's no special gimmicks, tricks, secrets or ulterior motives - I know Reddit has a pretty big history of sharing the weird and the wonderful, but this place knows what's what when it comes to hardcore material that is relevant to a bulk of the Reddit community's interests.
It boasts a total readership of 125,000 readers and sees new material submitted about 10 times a day. Of course, if you think there should be more hardcore material submitted to /r/NSFWHardcore, you're more than welcome to head on over and share your content with them.
The rules are pretty simple: images and videos are both welcomed to be shared, although the former are definitely more common. Oh, and all of the submissions have to involve girls getting fucked. It is hardcore, after all.