Modesty, touching, etc.

Recently, I revisited my chapters in Shnarev's article on the subject of women's dress code, and in Rabbi Inbal's response, and even in column 499 dedicated to the subject, and I wanted to ask a few questions, as a guide for further consideration (sorry for the length):
A. Do you think there are any minimum modesty laws? I mean, a prohibition on exposing the body beyond a certain line (the extreme example would of course be complete nudity or a swimsuit, in a place where there is no sea), which is independent of social circumstances.
on. As for the part that depends on social circumstances, who is the society that determines this? Can a society that has sexual permissiveness and a declared desire to reveal (like parts of secular society, where the discussion of clothing concerns how sexually attractive one is) still set boundaries for dress? Or is the measure just a society with a 'right' world of values ​​(not sure if there is one, but pretty sure there is a 'wrong' one) in this area?
third. Is there a prohibition on touching in technical terms? For example, in a noisy event hall, when you want to get someone's attention and lightly touch their shoulder, or when helping someone up a difficult hill on a hike, and so on.
D. Is there a prohibition on touching in a "routine" way that is not affectionate? For example, a handshake, and to go to the extreme, even a hug or a kiss of peace, which is common in certain cultures (for example, among the French, men and women kiss men and women on the cheek, and there is no excessive closeness in this, it is done even between complete strangers in a certain social atmosphere). As I understand it, this is purely polite. I even had the impression, when my friends stopped doing it due to religious insistence, that their very cessation was pouring sexual content into the matter that was not there.
the. What do you think of Rabbi Inbal's claim that even if there is no "blind front" in the technical sense in women walking immodestly, it is still appropriate for a religious society to create a reality in which women's clothing does not constitute a stumbling block for men (a kind of "blind front" argument, or if you will, a kind of Spasst-Nicht argument, "We cannot possibly maintain a society that stifles.")