What is your strategy for dealing with desire discrepancy (when one partner wants more or less sex than the other)?

One lady I read about says that neither she nor her man is allowed to say no to the other. They must at least let the other person attempt to get them in the mood through teasing, touching, etc... If they aren't in the mood for sex, they say something similar to, "I'm not really in the mood right now. Convince me." That really works for them.

Is desire discrepancy a problem for you?
How do you handle it?