I was watching a documentary on teenage girls being enticed into the porn industry by scheming pornographers that advertised their work as "modeling" and coaxing them into hardcore porn from naivety. At one point, one of the directors hands a girl this giant black dildo and says something like, "You're going to want to practice stretching out your butthole with this.". The girl looks at this dildo like a child who accidentally orders a quad stack pancake at iHop because he's been screaming at his mom that he doesn't want to order from the kids menu and his mom tells him he has to finish it, because if big boys can order their own food, then big boys can eat it, too.
That's where it starts.