After a brief research, I've read this in an article of hubpages.com: "...placed on mostly porn sites in the hopes that a user will click on the ads. These clicks take the user to third party websites owned by Adengage advertisers. The system works quite well for the publishers. The problem comes in when you examine the quality of the traffic provided by Adengage. Traffic quality is measured by how many people that click your ads actually purchase the product or service offered by the advertiser. Adengage traffic quality is notoriously low because as a matter of policy, their system is wrought with publishers that use deceptive methods to acquire ad clicks..."
In addition to adsense there are lots of ppc sites which is good as per my view. I use ppc sites to earn more and more. you can check various good ppc site links and use some good links which you like most in earnin purpose.