Yes, RetailMeNot is one of the most popular but I'd personally pick someone else, someone that supports the adult industry and hasn't succumbed to the mainstream pressure (like the UK).
From retailmenot.com /coupons/adult
"Here at RetailMeNot, we've decided to clean up our act.
This means we will no longer provide coupons for adult-themed products on our site. We apologize for any inconveniences."
I say GFY to them!
