I am not a dating site user myself but my best friend is. I have been known to look through the site with her after a few glasses of wine - not for myself, helping her short list a few.
Several times now I have come across profiles with photographs of me I know are married. Neighbours,colleagues,kids friends Dads,some one in a club I belong to etc etc.
None of these people are close friends so I would never phone up the wife and say "Do you know your husband is on X site?" although I have pondered a few times.
It maybe they have an agreement with their wife but probably not. It just shocks me that I have seen that many with photos. I cannot help and wonder how many married men are on there with no pics on their profile.
I also have several friends who have discovered their husbands infidelity goes back to/originates from dating sites. I think it is rife.
I am in no doubt its not just men but because my friend isnt looking at female profiles I cannot comment on how many women I may know doing the same.
My friend has had a woman in tears on the phone accusing her of being a life wrecker etc etc. She had no idea "her" bloke of 3 months was married with 3 kids under 7 to a woman 20 miles in another town.
Alot of these people/cheaters just dont care. They are not only lying to their partners/wives but also the people they date/shag too. Very deceitful and alot of pain that can be caused.