It depends on your definition of "feminine". The industry standard for "feminine" has varied over the centuries. Does it mean that you feel as though you are a woman, or that you are attractive to men? If you consider the two to be be synonymous, then is attracting men the only use for women?
If so, then advertising would dictate that the erogenous zones are exaggerated - walking so as to wiggle the rear end invitingly (high heels), showing the legs as far up as the crutch (miniskirt), exposing the nipples (Egyptian court dress), making the skin look as young and nubile as possible (makeup), outlining alternative entry points in bright colour (lipstick) And avoid any suggestion that you might wish to do more with your life than adore him.
But clearly, if that is so, the best way to be/feel feminine is never to wash "down below" . The smell is designed to turn men on.