Premarital abstinence pledges don't work: Study

Rosenbaum focused on about 3,400 students who had not had sex or taken a virginity pledge in 1995. She compared 289 students who were 17 years old on average in 1996, when they took a virginity pledge, with 645 who did not take a pledge but were otherwise similar.

She based that judgment on about 100 variables, including their attitudes and their parents'' attitudes about sex and their perception of their friends'' attitudes about sex and birth control.

By 2001, Rosenbaum found, 82 percent of those who had taken a pledge had retracted their promises, and there was no significant difference in the proportion of students in both groups who had engaged in any type of sexual activity, including giving or receiving oral sex, vaginal intercourse, the age at which they first had sex, or their number of sexual partners.

More than half of both groups had engaged in various types of sexual activity, had an average of about three sexual partners and had had sex for the first time by age 21 even if they were unmarried.

"It seems that pledgers aren't really internalizing the pledge. Participating in a program doesn't appear to be motivating them to change their behavior. It seems like abstinence has to come from an individual conviction rather than participating in a program," Rosenbaum said.

While there was no difference in the rate of sexually transmitted diseases in the two groups, the percentage of students who reported condom use was about 10 points lower for those who had taken the pledge, and they were about 6 percentage points less likely to use any form of contraception.

Rosenbaum attributed the difference to what youths learn about condoms in abstinence-focused programs.

"There's been a lot of work that has found that teenagers who take part in abstinence-only education have more negative views about condoms. They tend not to give accurate information about condoms and birth control,"
she said.

The study appears in the January issue of the journal Paediatrics.