WASHINGTON — How should you talk to your children about sex? Tell them no sex, says a new government Web site that proclaims "abstinence is the healthiest choice." That's dictating values, say organizations including the American Civil Liberties Union and gay rights groups, and they want the site taken down.

Michael Leavitt, secretary of the Health and Human Services Department, says the Web site is right on target.

The site was designed for parents who are embarrassed about talking with their children about sex, Leavitt said in a statement.

"Parents have a tremendous amount of influence on their children, and we want them to talk with their teens about abstinence so that they can stay safe and healthy," he said.

Promoting abstinence is fine, said Monica Rodriguez of the Sexuality Information and Education Council of the United States, but the government should also address the needs of teenagers who are already sexually active, gay or lesbian, or who have been sexually abused.

For example, she said Thursday, the site should promote the proper use of contraceptives, and it should not imply that homosexuality is wrong by encouraging parents of gay or lesbian children to consult a therapist.

"By and large, it's a Web site that believes in abstinence until marriage," said Rodriguez, whose advocacy group promotes comprehensive sexual education. "Everything on the Web site is designed to promote that value and help parents communicate that value to their children."

Her 41-year-old organization as well as the ACLU, the National Education Association and more than 100 other advocacy groups are asking HHS to take down the Web site.

Bill Pierce, an HHS spokesman, said he was not surprised certain groups dislike the site.

"They've always opposed us on the issue of abstinence. That's fine," Pierce said. "One thing we do know about abstinence is that if you practice it, you will not have an unintended pregnancy or risk catching a sexually transmitted disease."

The site advises parents to tell their teens why they should not have sex: "Tell them abstinence is the healthiest choice. They will not have to worry about getting pregnant or getting someone pregnant. They will not have to worry about sexually transmitted diseases, including HIV/AIDS. Nor will they have to worry that the person they are dating is only interested in them because of sex."

And it paints a bleak picture for teens who get pregnant: "Many teen mothers never finish high school. Teen mothers and their babies are more likely to have health problems. And families started by teen mothers are more likely to be poor and end up on welfare."

For parents of teenagers already having sex, there is a section on contraception.