I'm writing a new story that has a few explicit scenes, and takes place in a fantasy universe. Problem is, one of the MCs starts the story at age 17. He has a relationship with another 17 year old before the main relationship starts when he's 18 with a man four years older.

Is a 17-year-old protagonist too young for erotica? Should I avoid explicit detail when he's younger, or just age him up to 18?