There are definite cross-cultural elements in this, and I'm not going to argue against the thesis that the Japanese are weird. But a part of this whole sorry business is the idea that comics are just for kids. That's not something the Japanese believe, or the French, or... Well, it would be a very long list of countries and cultures. And the whole thing depends on the problem of just what "appears to be a minor". Which means under-18, if I understand right. I doubt that even big tits are a guarantee of a person's age being over-18. Not these days.