This is how rich people get away with that shit; hanging out with young people isn't a crime if you're an adult.
So, find a minor who has either no homelife, or parents they're trying to get away from, make them dependent on you, then tell the to deny anything when asked.
If their guardians don't care, and the minor themselves refuses to report or testify, you're all clear.
Modern sex laws are a joke, they're about controlling young people, and arresting anyone who isn't rich. Sex crime is a privilege for the rich in many countries and then they'll tell you hentai, titties, and orgasms are evil.
I love how Oda handles that with the Celestial Dragons, and shows just how creepy and broken the whole system is. Oda is a pervert, but I think he definitely respects women and their sexual freedom. I mean, yeah, there are perverted characters who are protagonists, but it's a pirate manga. The protagonists are criminals, they aren't perfect. But they're miles above trash like Charlos, it's crazy when people act like Sanji is anywhere close to that.