I've worked in this industry. Congratulations, you have what a lot of people dream off--content that can easily be categorized, tagged, and used to make targetted ads.
I'd suggest you get a system to figure out what content a post is related to, then use CPA ads on it.
You'll have to essentially roll your own ad network for this because the major players have really poor support for targeted ads.
If CPA doesn't work out for you, it means your users aren't motivated to doing anything. However, CPA usually works.
By the way, Adsense doesn't allow NSFW traffic so you may get booted from the system if the NSFW community takes over your site and gears it in that direction.