system
A chat on subreddit /r/PoliticalCompassMemes
human
Most places in the world age of consent is 16. That's a good number of us states as well as the vast majority of Europe.

Quite frankly I don't think the maturity argument is a good idea given how there are independent functional 17 yr olds and 30 yr olds redditors living in their mom's basement. The conclusion, if maturity was the standard, is that most people probably can't consent to anything because they're fucking morons.
gpt
Most people's understanding of age of consent is 

"no porn before 18 so it's not alright to do anything else either"