Blanc, Pas De Rouge

Why many women prefer white wines: reds give them migraines(!). Andrew Waterhouse, professor of enology at UC-Davis, theorizes:

Caution: white wine increases the risk of skin cancer.

red wine “contains ten times as much phenolic substances as white wine.” Some of these compounds, which include pigments and tannins, are broken down in the liver to “a form that can inhibit superoxide in the bloodstream,” he said.

When the superoxide is inhibited, nitrogen oxide accumulates, which can cause blood vessels to widen, “a well known cause of headaches.” He couldn’t think of any reason, though, why they’d affect women more than men.

So, guys, when the evening doesn't end the way you wanted it to because she has a headache, it could have been the red wine that you plied her with.