I can't comment on candidclicks, as I've never used them before.
But, if you're looking for adult pay per click programs, check out
http://www.fpctraffic.com/ - 2 programs to choose from; on time payments for the past 6+ years.
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AdultAdBroker - Buy and Sell Your Flat Rate Banners, Links, Tabs, Pops, Email Clicks and Members' Area Traffic - updated January 2026