Common Sense

Just like the human body the human brain changes quickly during puberty then slowly for the rest of your life. There is no magical point of "fully matured". That's a garbage paradigm.

Looking for it creates lots of dumb clickbait that people love to parrot tho'

Do people really believe that 20 year olds are children and no one ever in the entire history of the world noticed this? and the only people who ever got it right are in the USA in the last 20 years?

That is just astoundingly ridiculous.

A: I don't think 15-year-olds should be having sex.

B: The law doesn't say who should or shouldn't have sex. It says who gets incarcerated for having sex. So the question isn't who should have sex. The question is who should be imprisoned for having sex.