There isn’t any alternative. Juicy Ads, Exoclick, etc. all pay about ONE PERCENT of what Google AdSense pays. I would hardly call that an alternative. With AdSense, I get an average CPC of $0.05 to $2.50. The most I’ve ever seen out of Juicy Ads is about 1 cent per click.
And the so-called porn site affiliates are just taking advantage of you, plain and simple. PornHub for example, pays an average of $2 per ONE THOUSAND clicks.
For 1,000 clicks on Google AdSense, you can expect between $50 and $2,500. And Google AdSense doesn’t count only unique clicks like PornHub does.