Adult Friend Finder is one of the few popular affiliate systems that work well for Adult oriented web sites. You are able to chose what kind of ads are shown on your site. Some are much more explicit than others.
AFF has many types of payout methods. You can be paid by users clicking through your site and signing up for one of its web sites, or by click through, etc. Like many affiliate options this site pays best for higher traffic web sites that are adult focused.
AFF also has many other sister web sites that range from cams, specific dating sites, etc. If sexual explicit dating sites are not your thing they may have others you can promote instead.