Best Content Locker, Particularly That Allows Adult Content?

As the title suggests. This is what I am looking for.

I have some content that is adult, some not. I used some Adult CPA company years ago, but never saw any sales really.

So, what are some good cheap offers to push? Or, networks?

Basically, for one site, I have a service that normally costs 25$, so people can paypal that and I provide the service, but kind of like with some software, I would like to offer an alternative payment method.