How much do single women value sex? According to a new survey, it depends where you live. Online dating site, Chemistry.com, asked over 10 million singles across the country whether they strongly believed that sex was an essential part of a relationship. The question was part of a larger personality test, overseen by the website’s chief scientific adviser, biological anthropologist Dr. Helen Fisher and addressed both men and women. After breaking down the data, Chemistry.com looked at the 10 cities...