For anyone who argues about a lost innocence in our culture, and who fondly looks back on the good old days before the '60s ushered in an era of horrible sexual proclivity, take a look at this study. 9 out 10 Americans have had premarital sex. And that number is the same for people who got married in the 1940s and for people who got married last week. Everyone loves their premarital sex, that's the bottom line.