I'm around several networks of women where 80% or greater are cheating on their husbands and they also giving their marriage a low priority. I'm not saying its common, most common, least common, just that this sample is out there.
The sample of women and marriages that I mentioned, is just among certain groups in a certain area that do this, and I know it does not represent the country as a whole.
I know we have highly sexxed and immoral with respect to marriage, and also situations where the sex drive has declined from lack of interest and lack of use.
For the complainants, they can also initiate the sex acts or affect sexual behavior with new ideas to prevent boredom.