All societies have taboos, and some Westeners with looser taboos than Muslims think they are "free". Just try having sex in public in the USA! Essentially, does it really matter which parts of the body or which actions of the body are acceptable in public? Maybe a case could be made for allowing everything, but there is no society where this is so, at least as far as I know.
Israeli teen lightly wounded from stone throwing in West Bank settlement of Kiryat Arba (Haaretz)
from the article: Egypt’s politics stripped naked