It's also a PERFECT metaphor for the Wrong Way to teach your child about sex. Not kidding. Let me frame it up for you.
Princess Elsa has magical powers, which are fun and playful, until someone gets hurt unintentionally. Faced with unexpected consequences, her parents race off to “the experts” to find out what to do about Elsa's “problem.”
The experts convince Mom & Dad to isolate her. They say, "Elsa, your power will only grow. There is beauty in it. But also great danger. You must learn to control it. Fear will be your enemy."
Her father says, "We'll protect her. She can learn to control it. I'm sure. Until then, we'll lock the gates. We'll reduce the staff. We will limit her contact with people, and keep her powers hidden from everyone."
Back home, her parents put up all sorts of physical boundaries and repeatedly remind Elsa how dangerous her powers are. Very soon, Elsa thinks of herself as a freak who has to pretend to be something she’s not. Her younger sister gets no explanation from either her parents or her sister about what is going on, and why everything has changed.
Mom and Dad apparently assume the younger princess, Anna, is in no danger because SHE doesn’t seem to have any "magical powers." As it would relate to sexuality, this is when adults assume, since the "plain" girl isn't going to be chased by boys, no one will have to worry about her.
When their parents are eventually out of the picture (it is a Disney movie after all!), there are no other adults around to help the girls navigate the challenges of life, and the allure of their sexuality.
Then one day, simply because it's on the calendar, the girls are trotted out unprepared to live on their own! With no guidance, no training, they are launched into the Big Wide World. [Note: Can you tell I'm not a big fan of the common practice of "you can date when you're 16"?}
- Elsa is unable to control the results of her naturally occurring powers. Ultimately, she rejects personal responsibility in favor of doing whatever she wants.
- Anna falls for the first guy who comes along because she a) has never experienced magical tingly feelings and b) has no expectation that she will ever have another opportunity to meet a man.
Sure. Mom and Dad could have explained to Elsa that heterosexual males will be attracted to her, she will have to learn to manage her "magic." They will help her, and she will have the opportunity to practice. They reassure her there is no reason to feel shame or fear, but they do expect her to work at not giving in to the desire to use her powers in hurtful or selfish ways.
Elsa then models restraint for her little sister Anna, who may not have Elsa's magical powers, but undoubtedly will have a similar desire to use people in hurtful or selfish ways.
Every adult in contact with the little princesses -- not just the parents -- encourages them to keep practicing restraint and self-control, because those are the skills that lead to both happiness and health.
The End. OK... it's not nearly as charming as the sacrificial act at the end of Frozen which is completely unexpected in a DISNEY film... but in Real Life, it would a very good ending of childhood and a wonderful beginning for these two young adults!