I would say that a fair majority know when they show off their charms. Men strut, and show off; we are fairly obvious if we feel confident. Women are a tad more subtle as far as I've seen. A bit of leg, a slightly low cut shirt, etc. It's a technique, and it's fairly effective unless the guy is like me, and is going to be clueless until about a month or so after a woman showing herself off.
That said, women who go overboard are a bit tacky, I think.