It's been about 20 years since I did sex education at school, but I don't remember them ever saying that cellulite is common.
Throughout my teens and 20's I always thought that cellulite was a sign of unfitness and/or bad health. It's only in recent years that I've learned that 4 out of 5 women have it, and I've seen it on young fit girls with nice slim figures.
Do they teach properly about cellulite in sex education in schools nowadays?