Itai News has singled out this problem page letter (Japanese)
A woman and her husband are 23 years old and in the first year of marriage. One night, they began to have a post-coital chat about their first sexual experiences The wife revealed that she was 18 when she had her first experience. She went on to say that it was with a 51 year old man and that she had kept up a casual sex relationship with him for around three years. All this was before she met her husband. It probably would have been best if the wife had stopped there but she then added that the 51 year old man was actually her husband's current boss. The woman had joined the company at 18 and taken up with the older man. Her husband joined the same company later and then young love bloomed.
When the wife finished her story, she says that her husband's face turned very pale and he suddenly ran off to the toilet and threw up. He then seemed to have some kind of fit. She apologized the following morning but he was still out of sorts and she reports that they have not successfully had sex since.