If that's part of the curriculum, then yes.
Don't know about that number, but I do know that ignorance (Abstinence-Only sex education) doesn't help.
"Over the past 25 years, Congress has spent over $1.5 billion on abstinence-only-until-marriage programs, yet no study in a professional peer-reviewed journal has found these programs to be broadly effective. Scientific evidence simply does not support an abstinence-only-until-marriage approach.
Federal Evaluation Finds Abstinence-Only-Until-Marriage Programs Ineffective
In April 2007, a federally funded evaluation of Title V abstinence-only-until-marriage programs was released. The study, conducted by Mathematica Policy Research Inc. on behalf of the U.S. Department of Health and Human Services, found that abstinence-only-until-marriage programs are ineffective.
Mathematica’s evaluation found no evidence that abstinence-only-until-marriage programs increased rates of sexual abstinence—the entire supposed purpose of the programs.
Students in the abstinence-only-until-marriage programs had a similar age of first sex and similar numbers of sexual partners as their peers who were not in the programs.
The average age of sexual debut was the same for the abstinence-only-until-marriage participants and control groups (14 years, 9 months).
Abstinence-Only Programs Do Not Affect Rates of HIV Infection or Sexual Behavior
A July 2007 “meta-study” published in the British Medical Journal reviewed the most recently available data examining the results of 13 abstinence-only trials including almost 16,000 students.2
Abstinence-only-until-marriage programs were ineffective in changing any of the behaviors that were examined including the rate of vaginal sex, number of sexual partners, and condom use.
The rates of pregnancy and sexually transmitted diseases (STDs) among participants in abstinenceonly-until-marriage programs were unaffected.
As a result of this meta-study, the researchers concluded that recent declines in the U.S. rate of teen
pregnancy
Abstinence-Only-Until-Marriage Programs Negatively Impact Young People’s Sexual Health
Virginity pledges—promises that young people make to remain abstinent until marriage—are becoming increasingly popular in schools and communities across the country. While not a program in and of themselves, virginity pledges are so common in abstinence-only-until-marriage interventions that having taken such a pledge is often an indication that a young person has been involved in an abtinence-only-until-marriage program.
Research on virginity pledges found that for a select group of young people, pledges did delay the onset of sexual intercourse for an average of 18 months (a goal still far short of the average age of marriage).3 However, the same study also found that young people who took a pledge were one-third less likely to use contraception when they did become sexually active than their peers who had not pledged.4 In other words, pledges can cause harm by undermining contraceptive use when the young people who take them become sexually active.
The researchers also found that pledgers have the same rate of sexually transmitted diseases (STDs) as their peers who had not pledged. Not only were pledgers less likely to use condoms to prevent STDs, they were less likely to seek medical testing and treatment, thereby increasing the possibility of transmission.5
Further research found that, among those young people who have not had vaginal intercourse, pledgers were more likely to have engaged in both oral and anal sex than their non-pledging peers. In fact, among virgins, male and female pledgers were six times more likely to have had oral sex than nonpledgers, and male pledgers were four times more likely to have had anal sex than those who had not pledged.
According to the researchers, in communities where there are a higher proportion of pledgers, overall STD rates were significantly higher than in other settings. Specifically, in communities where more than 20% of young adults had taken virginity pledges, STD rates were 8.9% compared to 5.5% in communities with few pledgers.
“Published by SIECUS, the Sexuality Information and Education Council of the United States, 90 John Street, Suite 704, New York, NY 10038,
www.siecus.org.”
source (pdf)