Well, my comment was made half in jest, but honestly, I think it'd be interesting to see what happens if the censorship laws were revoked. Obviously there's more to a relationship than just sexual urges, but it could lead to something special.
Anime commonly has the tsundere or deredere types, which I wouldn't describe as being passive. I think that's encouraging, in that it would encourage dominant or outgoing Japanese girls to behave the way they're inclined, without feeling like it's socially unacceptable.
On the down side, there is an unusual focus on breast size in anime. That'd give a lot of girls some insecurity. Ah well. Such is life. An important part of living is our struggle to overcome insecurities. I sometimes think that if we lived in a perfect society, that accepted us exactly as we were, we'd have no reason to work, change, and evolve. So, ironically, the perfect society is the imperfect one. Wait, how did I get to this by commenting on anime breast size?!
I have seen Girls Und Panzers, but quite a while ago. Can't remember too many details, other than I enjoyed watching it.