Part of the confusion about the nature vs nurture debate is that its all an artifact of the way we chop up realms of knowlege. When you refer to something as 'biological' you pretend that that doesn't encompass sociological and anthroplogical considerations as well.
A better illustration of what I mean is the misuse of the term "natural." Human society is a part of nature. Therefore strip-mines, auto-assembly plants and breast implants are every bit as 'natural' as beaver-dams and coral reefs