The kind (and amount) of information divulged—about the users themselves, the places they work, visit or live—are not only useful for people looking for a date, but also to attackers who leverage this information to gain a foothold into your organization.
After Lavalife, I only know of a few others that are worth mentioning, although I've yet to find one that's truly ideal.
My preferences would be Club Intimate, Fling, Adult Match Doctor, and Get It On, As for adult dating sites that I don't recommend, see my reviews for Shag Pal and Adult Friend Finder.
It's pretty hard for any site these days (especially the big ones) to stop fake profiles and scammers from signing up, but I think I get what you're after.
There are a lot of adult dating sites that don't have a lot of users, or use sneaky marketing tactics like the bait and switch you're referring to.
Location can be placed right on the target company’s address, setting the radius for matching profiles as small as possible.