03/28/2008 02:43 am ET Updated May 25, 2011

Study: Over Half 15- To 19-year-olds Have Had Oral Sex...

More than half of American teens ages 15 to 19 have engaged in oral sex, increasing to nearly 70% for those who are 18 and 19, according to the largest federal study of the nation's sexual practices.

The study also found that 11% of women ages 18 to 44 reported having at least one homosexual experience in their lifetime, up from 4% in a similar survey conducted in 1992.

Taken together, the two findings suggest a shift in sexual practices, in which females are using oral and lesbian sex "as a safer alternative than [vaginal] sex with men," said epidemiologist William D. Mosher of the National Center for Health Statistics, the study's lead author.

Read more on The Los Angeles Times