I don't about the biggest (yet

) but we have a few sites that are growing. They aren't your normal dating site.
affairmatch.com and
desperate-wife.com are both tailored towards extramarital affairs and we also have
sex-match.net. All are free to join and to browse the member profiles, but have a fee if you want to message (like most dating sites).
We also offer a competitive affiliate program through
majorpay.com. Our program is getting there and hopefully with our Platinum sponsporship at XBIZ we'll have a larger base of webmasters to promote our products and sites to get them even bigger than before.
Please contact me if you'd be interested.