Has anyone heard of married men or women who don't sleep with their spouses?
Yes, but they are usually older couples where one or both partners have health issues (ED, cancer, heart disease). When it happens amongst younger couples, they are usually having some bad marital problems. Yeah, it actually is common. It doesn't make any difference in terms of dating outside the marriage though, does it? Married is married. The dude is cheating by looking around whether he's sleeping with his wife or not.