Yahoo Personals (often called yahoo profiles also people use wrong yahooprofiles.com link) is one the biggest players in dating business. And propably one of the best because i've never heard anything bad about them, unlinke true.com or match.com.
BUT i will tell you something - if you looking girl for f*** then this site is not for you. definitely not. you have to use adult dating sites, use pics and links above to enter the best service in this business.