I wrote a review/summary of the
Pimproll Adult Affiliate Program you may find useful.
I've never had a problem getting paid, and never heard of anyone with that particular issue with them so I think it's safe to say they're above board in that respect.
Before linking to any of the sites directly, I would recommend looking at the page source and checking the robots.txt file as most of the sites use canonical linking and a few disallow search engines from indexing pages with affiliate ID's.
Loads of great galleries and tools like the mobile whitelabel builder and domain parking.