Our manufactured outrage and new-found moralism obscures the fact that to a lot of women, an affair seems like quite a sensible proposition.
We - men as well as women - have more freedom, opportunity, and technology to enable us to have affairs than ever before.
Ever since the loosened sexual morality of the Sixties, when sex was more openly taking place outside marriage, we've been chipping away at the conventions of marriage.
Take the intelligent, sexy, independently successful Julia Gayet.
Whilst she has not been strung up by the mainstream French media in the same way that she would have been in Britain, Gayet maintains that she has been dragged into an alleged scandal unfairly and is therefore suing the French edition of Closer magazine. Quite possibly; after all she knows what she's getting herself into.
Have stable relationships ever been as fragile as they are now?
Add the fact that college campuses have become meat markets, that internet exposure means we're becoming sexually more mature much earlier in life (yet we're getting married and having babies later than ever) and what are we left with?
The reasons that married men have affairs are well documented: apathy, boredom, revenge, lust, excitement, etc.
But what a lot of people don't ask is why on earth a woman would want to knowingly get herself involved up with a coupled-up man.
Giving up the privileges of marriage but maintaining all the charm of convinient non-commitment?