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1. Adultfriendfinder.com
Adultfriendfinder.com is an adult dating site for people seeking sexual relations. It is known as, “The World’s Largest Sex and Swinger Personals Community.” Acquired by Penthouse Media Group in 2007, it won the Adult Industry Trade Magazine(XBIZ) award for best Dating Program of the year in 2010. 
2. AshleyMadison.com
AshleyMadison.com is a dating service that offers its members the opportunity to have discreet relationships outside of their marriage or relationship. The name was inspired by the two most popular baby names in the US in the year 2001, “Ashley” and “Madison.” It has a 70 to 30 percent male to female ratio.
Friendfinder.com is a dating site that is designed for both social networking and for those seeking romantic relationships. It has about 3.5 million members and is one of the most visited dating sites. Friendfinder.com has about a 50/50 male to female ratio.
4. Passion.com
Passion.com is an adult dating site for those seeking casual, intimate encounters. Founded in 1996, it has since grown to well over 34 million members worldwide. People hook up for casual relations quickly without having to spend too much time communicating in between. It has a 60/40 male to female ratio.
5. eHarmony.com
eHarmony.com
uses an exclusive model of compatibility that matches people based on certain characteristics. These characteristics are based on “29 Dimensions of Compatibility.” Harris Interactive(a market research firm) reports that an average of 542 eHarmony.com members marry every day.
6. Seniorfriendfinder.com
Seniorfriendfinder.com has over 500,000 members and is widely regarded as the most popular senior dating site on the internet. Though there is no real age restriction, it primarily caters to those in their mid-forties and older who are searching for friends, romance and love. It has a 60/40 male to female ratio.
7. Perfectmatch.com
