Responses
13 is the age of consent, where someone is considered capable of giving consent to sexual acts. 20 is the age of legality, where someone can drink and buy alcoholic beverages, vote, and basically do anything without a guardian's permit needed (when one is not considered a minor anymore)
But really, 13 is too young. A person is still undergoing puberty at this age and the time when they only start to fully understand themselves.
They say the uke is underaged but he is 19 doe? Nani?