The great-grandson of etiquette guru Emily Post says don't be cheap on Valentine's Day. Peter Post says it would be an etiquette blunder, for example, to take your significant other to a restaurant and then try to pay for the meal with a coupon. The head of the Emily Post Institute also says plan ahead for that romantic Valentine's Day dinner. Post says showing up at a restaurant at the last minute and trying to slip the maitre d' "a twenty" isn't going to work on Valentine's Day. Post's organization has partnered with Korbel Champagne on a Valentine's survey. He says one surprising finding is that slightly more women than men actually prefer to say home on Valentine's Day instead of dining out.