There are 2 sorts of men. 1 tells themselves that their spouse or lover is faithful to them and that they are getting away with it. The other tells himself that his lover or spouse is getting busy when he's not around because that makes him feel better about doing the same.
After I had been married to my first spouse for several years, she told me that married Japanese couples don't, as a rule, have sex after 5 years of marriage. Pharma research supports this. I took my spouse's assertion that married Japanese couples don't have sex as carte blanche to wet my willie where I wanted.
After that divorce, I was dating a young lady who drank tequila like many breathe oxygen. She was a single mother. Her daughter was a lovely person, as was my girlfriend.
At the time I was a middle aged American, salaried attorney in Japan. My Japanese, according to the Japanese I met, was better than many Japanese. So when my girlfriend, who, to a Western mind, would have every good reason to lie, told me that my first wife's 5 year estimate was about right, I was taken aback. Americans might be the most naive animals on Earth.