Cheater Checker – spying on your loved ones

According to Annette Lawson, author of "Adultery," published by Basic Books. "The various researchers arrive at a general consensus.suggesting that up to one half of married women have at least one lover after they are married in any given marriage. Married men probably still stray more often than married women-perhaps from 50 percent to 65 percent by the age of forty."

"Men and women cheat for different reasons," says infidelity expert Ruth Houston, who was recently quoted in a New York Times article on female infidelity. Ms Houston, whose ongoing infidelity research spans 10 years and encompasses both male and female infidelity, says 70% percent of married women and 54 percent of married men did not know about their spouses' affair.

Infidelity expert Ruth Houston is the author of “Is He Cheating on You?- 829 Telltale Signs”, a comprehensive guide which documents practically every known sign of infidelity. She has been quoted in the New York Times, the Toronto Sun, the New York Post, Cosmopolitan, the Christian Science Monitor, the Pittsburgh Post-Gazette, Marie Claire and numerous other publications here and abroad. She has also been a guest on over 100 radio and TV talk shows in the US, Europe, South America, and the Caribbean, including Good Day New York, TalkAmerica, Telemundo, BBC, The Breakfast Club, Caracol Radio Network, ClearChannel , the Mike Gallagher Show, and 1010WINS.

Cosmo conducted an online poll of 1,000 single men and 1,000 single women, and 55 percent of guys and a shocking 59 percent of ladies said they have cheated on a partner.

Adultery statistics state that 85% of woman who feel their lover is cheating are correct. 50% of men who feel their lover is cheating are right. - Associated Press

45-55% of married women and 50-60% of married men engage in extramarital sex at some time or another during their relationship (Atwood & Schwartz, 2002 - Journal of Couple & Relationship Therapy)

There are even more sources at Menstuff – it seems there’s a lot of it going around.