Google does not allow anyone to place adsense codes or what is known by Google Adsense to have porno or incentive placements for clicks.
Go tohttps://www.google.com/adsense/g-app-single-1

But the weired thing of this information is that Google themselve host pornographic contents on most of their Groups and notebook public pages: click here to check the page:
Hey Google! Wake up! Google’s servers to Host SEO Spammers Work

http://www.google-kai.com/hey-google-wake-up-googles-servers-to-host-seo-spammers-work.html

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I will not place ads on sites that include incentives to click on ads.
I will not place ads on sites that include pornographic content.