Have you noticed how ad services such as Adsense don't allow adult websites to advertise with them? Adult websites make more money that any other niche online. However, they are all just making money from membership payments. Why not make money from ads too?

ExplicitSense.com is a free ad service just like Adsense that is offering its services specifically to adult websites.
You get payout on 1st AND 15th of every month through Paypal or cheque, $50 is the minimum payout.

Register right now.

Website : http://www.explicitsense.com/register.php

The reason why Adsense and almost every other advertising network doesn't allow adult orientated websites to sign with them, as the networks are targetted towards a single group of people but are globally distributed to all ages.