Quoting: "Ads for adult friend finders or dating sites with a sexual emphasis are not permitted. Ads for other online dating services must adhere to the dating targeting requirements and the name of the product or service must be included in the ad text or image."
I know that Jeremy shoemaker made a fuckload of cash by doing affiliate facebook ads for Zoosk. and as Pink Donkey said above, It's allowed as long as you follow those guidelines.
That's exactly it, if you follow their guidelines you'd be able to. Not entirely sure what their specific guidelines are but as Pink Donkey stated it probably cannot be real adult oriented.