often, I have heard the phrase America has lost its moral compass. However, an overwhelming majority think that adultery is wrong:
US attitude on adultery:...virtually no one advocates adultery.
In fact, a majority of those surveyed in national polls continue to voice strong disapproval.
A 1989 survey from the Kinsey Institute for Sex Research at Indiana University showed 87 percent of 3,000 respondents describing extramarital sex as ``always wrong`` or ``almost always wrong.`'...
Divorce attorney Mitchelson says that in 34 years of practice he has seen adultery lose its stigma. ``I think it is a reflection of a society that has a lot fewer moral dictates than we used to have,`` he says. ``We treat marriage as something you can go in and out of.``
``There`s been a real change in the climate,`` says Weiner, co-author of a book about adultery called Stale-Mate. ``There`s no longer such a sense of being judged by the outside world. There`s a sense that you`re entitled to a good life, that you only go around once, that life is hard and that you should grab all the pleasure you can get.``
Therapists like Weiner point to their clients as a gauge of changing attitudes. When she began her practice 26 years ago, Weiner says, her patients would see her for months before discussing an affair. ``Now they come in, sit down, and tell me in the first session that they`re seeing someone. I have never seen so many people talk about affairs as they are now.``
Weiner offers the example of a friend, who was considering marrying an older man. ``The sex isn`t so great,`` her friend told her. ``But she said that was no problem, because she could always have an affair.``
Fred Humphrey, a University of Connecticut professor who has had a private practice for more than 30 years, says
adultery ``is still a source of enormous trauma, anger and strife`` in marital therapy. ``There`s still an enormous hurt and shock when infidelity occurs.``All the enlightenment in the world cannot diminish the effect when adultery hits home, Humphrey says. When it actually touches them, Humphrey says, ``people really still get socked between the eyes.``http://articles.sun-sentinel.com/1991-06-06/features/9103020284_1_advocates-adultery-adultery-causes-grief-marcella-weiner

http://themonkeycage.org/blog/2011/07/27/americans-have-become-more-opposed-to-adultery-why/
Irish survey on adulteryhttp://www.ark.ac.uk/sol/surveys/gen_social_att/nisa/1991/website/Religious_Observance/ADULTERY.html