I reckon Some men cheat, some men don't because some men are just born different is no excuse
It is oversimplifying and justifying infidelity

The women too for whatever reason whether money, being gangster moll, they become gumars for gangsters or civilians knowing the men are married

Vito the "honorable, respectable" man to his family but still turned a blind eye to his son, cheating on his wife and only mentioned his gumar only when Sonny shot his mouth off at the Solozzo meeting I reckon nothing "honorable, or respectable about that