A majority of Americans have had premarital sex, according to a 2007 article in Public Health Reports. This is true for current young adults and also young adults in the late 1950s and early 1960s. Data from the National Survey of Family Growth indicate that in 2002, 77% of Americans had sex by age 20, and of that percent, 75% had premarital sex. In comparison, of women who turned 15 between 1964 and 1993, approximately 91% had premarital sex by age 30. Of women who turned 15 between 1954 and 1963, 82% of them had had premarital sex by age 30. Additionally, when comparing the General Social Survey of 1988–1996 to the one of 2004–2012, researchers found that participants of 2004–2012 did not report more sexual partners since the age of 18, nor more frequent sex or sex partners during the past year than those respondents of the 1988-1996 survey. Furthermore, there appears to be no substantial change in sexual behavior contrasting the earlier era to the current one. However, current-era respondents were more likely to report having sex with a casual date or friend than reporting having sex with a spouse or regular partner. From 1943 to 1999, attitudes toward premarital sex changed such that young women's approval increased from 12% to 73% and from 40% to 79% among young men. People's feelings of sexual guilt also decreased during this period. As of 2005, less than 25% of people believe premarital sex is “always or almost always” wrong.