It could also be that mothers then have greater cognitive capacities to sort of sit down and discuss the pros and cons of waiting to have sex until you're older.
But clever filmmakers like Alfred Hitchcock found ways of subverting the Code.
While you certainly want to do things together, and create bonds in that way, you shouldn't be afraid to go it alone occasionally, if that's what you both want to do.
They are two different worlds whose starkly contrasting perspectives on life form the core of the film.