Four percent of US adults have never had sex in their lives, and the figure climbs to 12 percent in the case of Mexican-Americans, according to an official survey out on Friday.
"Approximately 96 percent of adults age 20-59 years have had sex, with the age group 20-29 having the lowest percent (91 percent)," the Center for Disease Control and Prevention (CDC) said in a report.
Eighty-eight percent of Mexican-American adults have had sex, a lower percentage than any other ethnic group.
The report also said 16 percent of adults first had sex before the age of 15, while 15 percent abstained from sex until age 21 or older.
The data was compiled between 1999 and 2002, the Atlanta-based CDC said.