Being a parent, and living in the US, I've never understood our open acceptance of violence but squeamishness of sex and nudity either.
To be honest, it's never bothered me one way or another. If something 'showed' up while my kids were watching we didn't make a big deal out of it. We never censored anything we watched or read with the exception of horror movies.
I might be alone but I don't think the human body is particularly beautiful. I don't think it's ugly...but...it's nothing I 'need' to see.