EAST LANSING, Mich. – Some progressives have zero tolerance for abstinence-based sex education.

Northwestern University professor Alice Dreger is a perfect example.

Dreger attended her ninth-grade son’s sex education class earlier this week at East Lansing High School in Michigan.

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She was offended by the material being presented, which she expressed through 45 angry tweets, according to media reports.

Dreger was specifically upset by the abstinence-based message being shared with students that day.

“The whole lesson here is ‘sex is part of a terrible lifestyle. Drugs, unemployment, failure to finish school – sex is part of the disaster,'” Dreger tweeted, according to a published report from the Daily Mail.

She seemed to suggest that premarital sex should be promoted in high school classes.

“‘I feel like raising my hand and saying, ‘Can I tell my sexual history, which involves a lot of pleasure before and during marriage?'” she tweeted.

Dreger also struggled to conduct herself in a mature and dignified manner, even in the presence of youngsters.

She told the Lansing State Journal she was asked to leave the school, and was banned unless she’s attending her son’s events, because she used obscenities in front of students after the class.

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But she thinks the banishment was politically motivated.

“She says she’s really being punished for shining a light on the use of a curriculum that’s driven by a conservative agenda,” the State Journal reported.

If Dreger had done her homework, she would have learned that her son and his classmates do receive comprehensive sex education lessons. She just picked the wrong day to get a full picture, and quickly jumped to conclusions.

East Lansing High School Principal Coby Fletcher issued a statement saying, “Abstinence-based instruction teaches that abstinence is the only way to be completely safe, but the curriculum also reviews contraception choices. This parent attended on a day where abstinence was being taught.”

It seems clear that Dreger had a preconceived opinion of the class and curriculum before she actually attended.

“The kid has invited me to his health class on sex ed to see how bad it is, so I’m going,” she tweeted before the class.

While Dreger seems to have no use for abstinence, and seems to believe sex education should promote the physical joys of intercourse, some facts can’t be ignored:

While teen pregnancy in the U.S, has been trending downward in recent years, it remains a significant problem.

In 2013, there were 26.5 births for every 1,000 adolescent females between 15-19, or 273,105 babies born to young women in that age group, according to the U.S. Department of Health and Human Services. Nearly 90 percent of those births occurred out of wedlock.

“In 2013, one in six (17 percent) births to 15- to 19-year-olds were to females who already had one or more babies,” the government report said. “The U.S. teen birth rate is higher than that of many other developed countries, including Canada and the United Kingdom.”

The other fact is that sexual abstinence is the one sure way for teens to avoid pregnancy and sexually transmitted diseases.

If Dreger wants to contest those facts, that’s certainly her right. But she may want to reconsider her approach, because some obviously find it less than appealing.

“After careful consideration, no MOM, we don’t want to hear your sexual history,” a reader from New Jersey wrote online.