There's truth to that. If you have a naturally high libido or one with more of a pronounced ebb and flow like me (mine seems to be directly linked to stress and anxiety levels) you'll be accused of cheating more for no other reason than that the "tide" is out because you've been on overtime for 4 months and you're time stressed.
I find this somewhat hilarious because men are always saying, "I'm not a damn machine. I can't just get it up because YOU want sex. That doesn't mean anything is wrong other than that I'm preoccupied or tired."
You'd think having experienced this themselves enough to make a pronounced and literal (they used whole sentences, not grunts) proclamation, they'd recognize the dynamics of fatigue and stress.
Nope. Obviously you must be cheating. You bitch.
Obviously.