I was only playing with a idea about how to make or use CSCart as a dating site. I guess there is only small adjustment that is to be maid on the script. The products today can be men and woman - you can add to your favorites. So it is only a mailing system missing instead of by now. And a possibility to log in and set up your profile. But I guess the marked for dating sites are small compare to shopping carts.
Their are plenty of dating type scripts available for this purpose that would probably work better, poke around on hotscripts.