It’s not uncommon here in Japan for men to have affairs. At the turn of the 19th century to the 20th, then lovers more formalized arrangements among the wealthy.
I know scores of men who either had (or are having) affairs, use prostitutes or get very friendly with bar hostesses.
There are a few “rules.” The husband should never flaunt the affair and needs to take a reasonable amount of effort to cover it up. The affair shouldn’t become public knowledge or the wife loses face. As long as it’s not public then many women will tolerate it, but very few, if any are happy about it.
If it does become public, then it can become an ugly matter with extended families becoming involved. I read about a woman who visited her hometown, and slept with her high school boyfriend, who had conveniently failed to inform her that he had recently married. The wife found out, and it took three-way talks between the three extended families to resolve the issue.
Many Japanese couples will often stop having sex after the children are born, and it’s an unspoken understanding that the husband will find his relief elsewhere. There are women who don’t care if their husbands are having affairs, as long as it’s only physical. One of my friends was having an affair, and asked his wife for a divorce. Her suggestion was that they stay married, and that the husband continue to see this other woman, but that he come home at night. As said earlier, I’m sure that she would have much preferred him not to have an affair, but it wasn’t an immediate end to the marriage.
I knew a businessman whose wife didn’t want him coming home until after his teenage children were in bed, so that it didn’t interrupt their studies. It was unspoken that having an affair would be a convenient reason for not coming back.
It’s not always the men who are at fault here. There are women, usually younger, who go after married men, usually successful types. This is a staple of Japanese TV dramas. I’ve talked to many women who are in this circumstance and some are hoping to get married and some are just enjoying the lifestyle.
It can get tricky if the “other” woman decides that she wants to force things along. Going on an overnight trip together and then putting her panties in the guy’s suitcase for his wife to find is known to happen. There have been the occasional murder result, which inevitable become sensationalized in the media.
When I was younger, I went out and/or slept with a number of women who were married and their husbands were having affairs. I was their revenge, I guess, but since I was young, I didn’t particularly care what the reason was that a pretty woman was sleeping with me.
The summary. It happens, perhaps more openly then in the States. Women have been more likely to tolerate it, but this may change as divorce becomes more common.
Like most other cultures, there are double standards and women’s affairs are less likely to be accepted.