As teenagers, Tony and Terry had done a fair bit of horsing around with girls. They weren't tall, but they both had the young Italian good looks that were magnets for emerging young women. However, their father was quite a martinet and he was given plenty of reasons to wield the belt to his young twins when they stayed out late with 'cattive ragazze'.
Tony was Terry's ticket to ride, metaphorically and literally speaking, with these 'bad girls'. And their sharing instinct was acted out playing 'secret swapsies' with their girls to double their women count.
Until love crashed in.