Handshake Question

There's so much you can assume of a man by his handshake.  Some people think they will have them all figured out and cement their first impressions based on the firmness of that meeting grip.

My question is, is what can you assume from a handshake with a woman?  Do you place those same internal accusations on a female?  Are you even supposed to shake a woman's hand?  Does the whole system of judgement get reversed, or completely thrown off the bus?