The number of ever-married men who admit to having cheated on their spouse is nearly 50%.
Not sure how much stock you want to put in that statistic, but I wouldn't be surprised if it were actually higher (since infidelity is one of those questions people are likely to lie about, even under anonymity). And that would mean it really could be "most people" who cheat. I've had a few candid conversations like this with friends (bar talk), and once the first brave soul admits "yea I've cheated", in come the flurry of others who do the same. I don't think it's something the average person's proud of; maybe the reassurance of its commonality helps assuage them of the guilt, I dunno.
There are also degrees of infidelity, obviously. Actively pursuing and fucking a married person is a much more flagrant example of it than making out with some stranger at a rock concert, which in turn is a more flagrant example than flirting with a stranger without ever touching them - but I'd argue even the last one is a violation of a partner's trust if they're not cool with it.
If you read the full article, the 50% thing isnt a statistic. Its a true false question, and the answer is false with self reporting being at around 20 to 25%. ---
Moops? "I thought you were making up diseases? That's spontaneous dental hydroplosion."