We’ve all been there. The butterflies in your stomach, the hours spent picking the perfect outfit, and the hope that this one might actually be different. But after 20 ‘disastrous’ first dates—ranging from the guy who brought his mom to the one who forgot his wallet—I’ve learned the hard way that there are certain unwritten rules you just can’t break. If you want to save yourself from another awkward night, pay attention. Number 7 is the one mistake that almost every woman makes without realizing it.