You misunderstood me.. I was not saying that we should be able to do whatever we wanted, anywhere we wanted to do it without any consequences. If a place has different norms or standards of what acceptable behaviour is like, it is alright to act within those new norms, even if you are from a place that has different ones. That's the fun of traveling and experiencing a new culture. Living with the consequences, the good and bad, goes without saying of course.
But it is not an excuse for awful behaviour. I don't think Amanda Knox was this wild party animal that behaved in such an unexcuseable manner that she shamed every American. What she allegedly did (her crime) had not that much to do with "normal" italian (or german) partying, and I am in no way intending to excuse or trivialise sexually abusing and murdering of roommates.
PS: A lot of Germans in particular are fervent believers in free body culture - the nudist movement, going back to nature and all that. It is more pronounced in the east, but seeing someone skinny dipping at a local lake in summer time is normal here. Not everybody does it, but nobody is offended by those that do. If a person feels uncomfortable by that they just have to go to a place that is less frequented by nudists, there isn't really a strict rule in public beaches. I don't know what would happen if you walked around nude in the city - probably nothing much, but you'd get stared at alot. Freiburg had a nude jogger for a while, a man who always went running naked until people made complaints so often that the county and city officials had to step it. I think they made him wear a string tanga.. I don't really know if that was an improvement though. I've never actually seen the guy run, but I don't go jogging.
Switzerland has even passed a law (in one district) that bans nudist hiking. Apparently, that is a favourite pastime for some for reasons that escape me.
As for your walking around nude in a place that is ok with it, then it would be OK. It all depends on your environment, on what the social etiquette allows.
Good ole roman republic and its descent into amorality. I trying to remember the roman senator who always lamented that fact, was it Cato the elder? Or was he the one going on about "ceterum censeo carthaginem delendam esse"?