[sigh]...if only Michael were a nicer person... This raises another point" It is de rigeur for Mafiosi to have goumars. But there is no hint, either in the films or the novel, that either Vito or Michael philandered.
there is no hint, Vito philandered He knew Sonny had goumars but did nothing until his brain going soft from all that comedy playing with that young girl affected business
