The significant type-in traffic will help get over the network effect issues that plague most dating sites, and your traffic is very targeted- people looking for sex(or at least naughty pics). So you'll quickly have a core of active users you can leverage to build your audience.
Dating sites done right are FAR more profitable than porn sites.
Amateur Match conversion rate is between 14-22%, paying out an average EPC between $0.70-$1.07.
If they can afford to pay more than $1 per click and still be highly profitable, I assume they're converting free users to paid/upselling quite well.
If someone remains a member an average of 3 months at $30/month, you're looking at a CLV approaching close to $100.
That seems odd to me because if the dating site works people will not be coming back.
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.