Is The "Quinceanera" The "I Can Get Fucked Now Event?"

That is not my opinion, it is from: here, from Slate:

The quinceañera, even more than other traditional ceremonies, is a ritual designed to celebrate but also control a girl's sexual maturity. It is a formal, public granting-of-permission for a girl to adopt a more adult appearance, and with it a more adult way of behaving.