I'm going to go ahead and disagree with a lot of what is being said. Don't neg or teach on the dance floor.
If she's a social dancer you're going to come across as rude and ignorant. In the social dance world (Swing, Blues, Tango, Salsa.. etc) it's actually a built in convention that you never teach or correct people while dancing. The only time you're allowed to say anything is if their dancing physically hurts, such as if it wrenches your shoulder the wrong way. This is true of guys and girls and there's even articles about it on dance halls official websites.
http://southbayfusion.com/index.cgi?v=0320s9m4&r=s9m1
http://therentparty.com/Guidelines/Etiquette/
If you are any sort of a decent dancer, that whole reason behind a neg dynamic goes out the window (at least while on the floor dancing) and you don't need to take her value down to match yours. That's faulty thinking because it assumes your perceived value as lower than hers. As everyone has said, dancing well is a huge DHV.
*Note: Go ahead and neg off the dance floor if you'd like. The thing is people, men and women, often don't feel that confident about their dancing, especially in relation to someone who is better at it than them. Once they're off the floor though, and you're back into normal conversation/game, you return to fairly normal dynamics except with a bit higher value than before. So if you need to neg, do it off the floor!
The objective of dancing is to make her feel GOOD about herself.
If she's a complete beginner then go ahead and teach her enough of the basics that she can have a good dance with you, yet not so much as to overwhelm her. Be gentle, and kind, and humble about it. Mildly disqualify yourself saying you're an expert dancer but you'll try, and show her what you know. Then smile calmly as if to say "It's ok. You can trust me, I've got this. You're in safe hands"
Also.. the "myth" of people being good in bed if they're good dancers. I'm gonna go ahead and confirm that has been my personal experience. Girls I've been with pretty much fuck exactly the way they dance, you can feel how they're going to be by the way they relate to you on the dance floor. Several of my dancer friends agree (male and female)
I just realized this is a thread from 2007! I'm posting anyways because I hope some people will get value out of it, and it could re-open the discuss with a topic I'm personally fascinated by (having been hugely involved in social dance for a year, having read pickup literature for 4 years but never gotten involved in the sarging lifestyle)[/b]