DC is correct there was some mention in the book about Lucy being able to "handle" Sonny's manhood. Besides maybe Sonny liked 'em a little on the plump side...you know, tons of fun and all that.
"Io sono stanco, sono imbigliato, and I wan't everyone here to know, there ain't gonna be no trouble from me..Don Corleone..Cicc' a port!"
