Elsewhere they say the industry standard is 3 months average length of a membership. It properly takes that long (maybe not consecutive) if not more for somebody to get of the dating market permanently. A porn site has little chance of going viral (who wants their facebook status to be "John is browsing cocksuckersluts.com"?) and almost no chance of an upsell - but I know that people share recommendations of online dating sites and when there they are an excellent place to send people to other partners (looks like you are going on a date! Do you want to buy flowers and reserve a table for two at a romantic dinner?) something that is not likely to happen on a porn site.

> if the dating site works

That's a mighty big if. Especially for an adult dating site, where I'd guess the guy/girl ratio would be at least 500:1.