Who are all these women cheating with? Unmarried or unattached men?
Not sure it makes sense to say rate of cheating among women has increased but rate among men hasn’t.
Both unmarried and married men. If you read the men blogosphere and some of the research done by plenty of fish, women are increasingly sleeping with a smaller batch of men - roughly the top 10-15% of men. Those men are having sex with more women than ever while the next 25-40% are having less. So it’s actually not unrealistic to believe women have gone up and men has stayed the same - the women are just sleeping with the same men. I know one guy who sleeps with ~50 different women a year (he’s single)!