You, like many of us, might need at least three to five drinks on dates in order to show any real interest in how many siblings this person has or what their major was. However, if you have plans to take this person home, it might not work out as well as you think. In theory, the concept of "hot drunk sex" is great, but in practice, we're actually throwing little-known physiological obstacles in the way of our orgasms. Yes, booze makes coming harder for women, too.