Underground sites are less porn and more general adult-related content. We're talking UFC fights, topless modelling, Las Vegas brawls, naughty vines and more. For your consider today is ReBlop.com - it doesn't produce any unique content, but what it does do is hunt the Internet for the best trending content that's bound to put a smile on your face.
I'd say that around 50% of the content here is porn or sexual in nature, with the rest being weird, wonderful and freaky news stories. The site itself has a really attractive design and updates regularly with new material: you can also take a look at the various tags available to see specific types of material. Everything from social experiments through to school fights and leaked nudes are available.
So, if you want to venture underground to see the type of material that mainstream organisations are too scared to share, pay a visit to Reblop.com and get down to business.