It’s seems to me that you shouldn’t send nudes to anyone. A screen can’t match human intimacy, though I can imagine being sixteen and thinking it can.
If the person on the other side of the screen can’t cope with your decision to not send nudes, then that person shouldn’t be part of your life.
If a person does choose to send nudes, it seems to me that they shouldn’t be shared, with anyone.
But how many sixteen-year-olds do you know who are good at self-restraint?