Sure they would. Not 'all', but the majority would. If the right opportunity arose with no chance of discovery whatsoever? Like 95% would, if not more.
It's similar to the 'all men watch porn'. And all the 'nono, not MINE, I'm 100% CERTAIN of it'. Sure you are. The vast majority of them do. And so do lot of women.
I'd not only cheat 'if the right circs' arise, I actually did, multiple times, when abroad. My partner is none the wiser. I'm sure he did the same, as we both often travel without each other. Tbh, it's just a shag, what's the big deal, we're both quite relaxed about it.
I'd also 100% rob a bank, if there'd be zero consequences.
I'm a woman, not a man, just in case.