if my kid enjoyed eating an entire chocolate cake every day, should i allow that as well?
some behaviours are clearly more detrimental to his long term happiness than others.
sports keep kids in shape and help them develop important social skills. porn and video games do neither. i know which thing i would rather my kid be doing. you are welcome to let yours do whatever you please, just don't be shocked when they turn out do be basement dwellers at 30.