Bluepink, A very interesting observation from your part indeed, and a very true one. Had this been a reverse situation, first of all, they would have shown Pia in short hair, western looks and possibley revealing clothes. As far as our Indian (or Southeast asian) society goes, in Pati, Patni Aur Woh, the "Woh" will be a woman at least in the near future.
My point is : we as a society can not think of women as human beings. Because it is not convenient for us to do so. We still think of women as "ma" and "devi" and any woman who dares to be human gets stamped as a vamp. Pia won't be Pia as we know her in a hypothetical reverse situation. That kind of Pia will have more in common with hindi movie's Bindu type roles than this serial's Pia.