Sakura is legal in Japan, most of the US, and most of world.
James Franco tried to bang a 17 year old a few months back and many women called the girl lucky. Arnold Schwarzenegger banged a 16 year old when he was 28 and the woman brags about it to this day. There are tons of others examples like Brad Pitt, Marvin Gaye, and Paul Walker.
It's only wrong if the the guy is unattractive like Doug Hutchison or/and a loser. Same if the genders were revered as we all know. But if they are good looking and successful like Kakashi then it's cool.
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