interjection: you are putting the cart before the horse. The only reason why a woman has to cover certain parts is because of the possibility of a man seeing her. there is no chyuv for her (unless very zechusdik) to cover her hair- for example- in the house. I would even venture that, if she is only in company of women, many of the prohibitions do not apply.
so, you are erroneous in saying that the chyuv starts after the mans stopped looking. That obligation on the woman is clearly a function of the possibility of men seeing her.