In the Playboy adviser from years ago, it did an expose on shaking hands with women. I don't remember all of it, but it said you can show and detect many things about a handshake. Men tend to shake hands up and down in almost perfect rhythm. . Women tend to move a bit side to side and are usually not in rhythm. When a man is interested in a woman that he needs to shake hands with (which is always), then he should not shake straight up and down, nor in rhythm. Instead, he should use more side motion (half circles), and if he is really interested to use a pulsating squeezing motion.
After I read this article I started to shake hands with as many females as I could. I did find that there was a bit of truth to the above.