Passion.com Match.com, Speeddate.com, mate1.com, getiton.com, pof.com (Plenty of Fish), adultfriendfinder.com, Passion.com, benaughty.com, singlesnet.com, clickandflirt.com, etc. Many adult-dating-site complaints Scams and Frauds reported on ripoffreport.com under other individual site names. These are just a few with which I have direct experience. Palo Alto, California , Internet

If you use these sites for the advertised purpose, they will cost you a fee ranging anywhere from $20 - $35 or more Monthly. You cannot view other members profiles, you cannot send other members e-mails, you cannot even read the e-mails other members send to you unless you upgrade your account.
 
Once you upgrade, the messages you were receiving regarding people interested in you slow down or completely stop coming. The messages that you replied to, well, chances are you will not get a reply back. I sent more than eighty hellos, got back two and met NO one on passion.com.
 
I suspect the reason is most profiles are not full-paying members so they cannot read your message or see your profile.
 
Another odd thing is that in a few of these sites I didn't even have a complete profile set up before the e-mails, flirts, meet invites, and friend invites started coming in.
 
How is it possible for me to get so many women interested in me when all I have is a half-assed profile set up with minimal information and not even a picture of myself? It is Pure BULLSHIT fraud! I also noticed that once my paid membership stopped the e-mails started pouring in again. Amazing how I get a few winks and hello's from "new members" only after I had quit the site because of inactivity.
 
Quitting these sites is problematic.  Each makes you jump through a bunch of trick questions before they will stop the automatic monthly billing to your bankcard.
 
One nasty trick is getting you to close your account before you turn off the auto bill feature.  If you first close your account, your email and password will not let you back in to turn off the auto bill feature. 
 
One site threatened to turn over all records of my activity on their site to my bankcard if they were not properly paid.