People's behavior is contingent on what they can get away with. We might hate the office jerk, for example, but we don't punch him in the face because we can't get away with it. We'd get fired and arrested.
When it comes to women and cheating, they do it because they can. There is little downside.
In divorce settlements, women will often get awarded the house and kids even if they're the ones that cheated. They simply claim "abuse" and the chivalrous male judges (or man-hating feminist ones) go along with it.
(Spousal abuse claims, by the way, are the white women's variation on inner city killers pleas of "insanity" so they can get light sentences. Almost all lawyers get their clients to claim this as a matter of course.)
Then there's the social shaming. There is very little of that for women. New agey, Oprah-inspired concepts like "Your Best Self" allow women to justify virtually anything under the concept of "self-improvement." Even religious groups indulge in this sort of thinking, as the Dalrock blog has shown.
Women: "I had to sleep with all your best friends because I had to prove to myself I was attractive to men!"
The Greek Chorus of the American Media: "You go, girl!"
The only downside might be when the guy who gets cheated on complains. But then the women can call on The Costume Crowd.
What is The Costume Crowd? They're the people in society that think they have authority over us because they wear costumes. There is the cop costume (complete with badge!), the judge and priest's robe costume, the doctor's white coat costume, the sexy nurse costume etc. For whatever reason, humans instinctively bow down when they see costumes.
Anyway, The Costume Crowd has morphed from being helpful parts of society to being a support system for the bad behavior of women. All of these people would have called out women cheating back in the 1950s. Now they use their credentials to justify it all in the legal, religious, or psychological realms.
I'll end it there. I don't know if I can be more cynical or bitter than that.