I ignore this rule completely. I believe it is purely sexist at it's root.
Of course it's sexist; we are discussing different ways to shoot women and men. I'm deliberately sexist; I'm not going to start treating the two different subjects exactly the same.

Beyond the man-woman thing, though, what about view camera movement? When I take pictures of a building, if I point the camera up, i get converging lines which looks 'wrong', so instead of pointing the camera up, I use front rise, which gives an effect as if the camera was higher than it really is...I THINK the same effect could be achieved by raising the camera on a ladder or something. In portraiture, say for a full-length shot, should one put the camera at a certain height and use rise to achieve the perspective change, or raise the camera itself? Or is the effect identical?