I've actually asked them this many months ago and they okayed it. You just have to make sure you don't use the AFF banners that are too explicit, i.e. nudity, sex, etc.
On one of my sites I use both AFF and Adsense. Just don't use the AFF banners with the explicit images. I myself have a script which rotates suitable pictures of hot chicks.
Well I emailed Google and it appears. "Thanks for your email. As stated in our program policies, AdSense publishers are not permitted to place Google ads on pages with adult or mature content. I consulted with our policy specialists and they determined that Adult Friend Finder would fall under this category. I hope this information was helpful."
That’s right but different adsense customer care executives give different answers, some say its ok & some say it is against the tos. There is no synchronization between them when it comes to some rare questions.