Beginning in the 1950s, as premarital sex became more common, the stigma attached to it lessened for many people. In 1969, 70% of Americans disapproved of premarital sex, but by 1973 this number had dropped to 50%. By 2000, roughly a third of couples in the United States had lived together prior to marriage. During the second half of the twentieth century, premarital sex has remained steady for men, but 60% more women lost their virginity prior to marriage during this same period. This has altered the traditional nuclear family, with half of all children living with a single parent at some point in their life.