Why do women get carsick more often than men

Fast moving vehicles and video recordings have only existed in the last couple of centuries,a blink in evolutionary time.For most of our history,there wasn't that much that could cause this sensory mix-up,except for poisons.And because poisons are not the best thing for survival, our bodies evolved a direct but unpleasant way to get rid of what we ate that was causing the confusion. It's a pretty reasonable theory, but it leaves things unexplained, like why women are more affected by motion sickness than men, or why passengers get more nauseous than drivers.