Agreed; this is true of virtually all young men, in my experience, and many- though not all- older men.
I don't know if older men develop more self-control, or their libido decreases, or some combination of the two, but at least some of them are capable of turning down sex, on occasion.
Young men? Not so much.
Having an intimate understanding of this fact has led me to have more realistic expectations of marriage than I believe some of my cohorts have.
I hooked up, by chance or by design (likely some of both), with a guy who has comparatively little interest in sex.
I find that to be a positive attribute in a husband, because most of the time, except for random weird episodes, I have scant interest in sex also. So we're compatible.
And even so, I don't fool myself into believing that he could be trusted to remain monogamous under any circumstances.
All men are weak when it comes to sex. It's virtually universal.
There are circumstances in which virtually any man would cheat on his wife.
Some men encounter those circumstances far more often than others.
A good husband is one who tries to avoid ending up in a position where he's likely to cheat.
A bad husband actively seeks out such opportunities.
That's what I know about men and sex.
Others' opinions may vary.