Teachers in a dozen elementary schools across Seattle have been trying out new curricula around the topics of gender diversity, expression, and identity since earlier this year — issues that are outrageously inappropriate for the classroom — especially for young children. These are topics that parents, not public schools, should be addressing with their precious young ones when they, the parents, determine the time is right.

Yet despite its reputation for socially progressive politics, the Emerald City is not alone in its aim to push a sexually permissive and promiscuous agenda in taxpayer-funded public schools. This is now happening nationwide — which is why conservative parents are pushing back.

They are fed up.

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Mothers in North Carolina and several other states, along with Elizabeth Johnston, a blogger known online as the Activist Mommy, are uniting against “the graphic nature of sex education” with a “Sex Ed Sit Out” protest. They’re urging parents to keep their kids home from school today, on Monday, April 23.

“Parents have a right to know what’s being taught on school grounds,” Johnston told LifeZette in an email. “Your children belong to you, not [to] educational bureaucrats, and certainly not [to] Planned Parenthood or the Human Rights Campaign — the largest LGBT political lobby in the United States. Demand to see with your own eyes what’s being taught [to your kids].”

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Also, “follow the money,” as Rhonda Miller, education chairwoman of the Indiana Liberty Coalition and one of the protest organizers, advised on the group’s website, SexEdSitOut.com.

“Comprehensive sex ed is being rolled out across America, often sponsored by special-interest LGBT groups like Human Rights Campaign, and disguised as anti-bullying programs,” added Miller. “If it’s not OK for special-interest groups like the NRA [National Rifle Association] to be buying classroom time to push their agenda, then how is it OK for HRC [Human Rights Campaign] monies to be buying schools off to teach gender-bending ideology and anal sex tutorials?”

What started as a single sit-in is quickly gaining traction: Similar events are now scheduled throughout the United States, Canada, and Australia.

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The support base is also growing. So far, the group’s Facebook page has garnered more than 8,400 likes. “We represent millions of angry parents across America,” blogger Johnston told LifeZette.

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“The American College of Pediatricians applauds these parents for demanding the best for all children — namely, sexual risk avoidance curricula,” Michelle Cretella, M.D., president of the American College of Pediatricians, told LifeZette in an email. A mom herself, Cretella is a pediatrician and an expert in adolescent mental and sexual health.

“The failure of so-called comprehensive sex ed to delay sexual activity, and to decrease teen pregnancy and disease, was documented even by the Obama administration,” she noted. “It most certainly does sexualize our children at very young ages.”

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And “it is no wonder why,” she continued. “All adhere to the Sexuality Information and Education Guidelines, which were created by Planned Parenthood and LGBT activist organizations that call for sex ed to begin in kindergarten. And let’s never forget that the healthiest behavior for all teens — sexual abstinence — is detrimental to Planned Parenthood’s bottom line.”

It stands to reason that Planned Parenthood, responsible for the abortion of millions of babies in the U.S., would never admit as much. Since 1978, Planned Parenthood has helped end the lives of approximately 6,803,782 babies.

Elizabeth Economou is a former CNBC staff writer and adjunct professor. Follow her on Twitter.