A principal of a Florida school has been forced to resign after a parent complained that sixth-grade students were exposed to pornography.
The complaint arose from a Renaissance art lesson where students were shown Michelangelo's statue of David.
The iconic statue is one of the most famous in Western history.
But one parent complained the material was pornographic and two others said they wanted to know about the class before it was taught.
The 5.17m (17ft) statue depicts an entirely naked David, the Biblical figure who kills the giant Goliath.
The lesson, given to 11 and 12-year-olds, also included references to Michelangelo's "Creation of Adam" painting and Botticelli's "Birth of Venus".
Principal Hope Carrasquilla of Tallahassee Classical School said she resigned after she was given an ultimatum by the school board to resign or be fired.
Local media reported that Ms Carrasquilla did not know the reason she was asked to resign, but believed it was related to the complaints over the lesson.
They also said Ms Carrasquilla had been principal for less than one year.
In an interview with US outlet Slate, the chair of the school's board, Barney Bishop III, said that last year the principal sent a notice to parents warning them that students were going to see Michelangelo's David - but that this wasn't done this year. He called it an "egregious mistake" and said that "parents are entitled to know anytime their child is being taught a controversial topic and picture".
"We're not going to show the full statue of David to kindergartners. We're not going to show him to second graders. Showing the entire statue of David is appropriate at some age. We're going to figure out when that is," Mr Bishop said.
On Thursday, Florida's governor, Ron DeSantis, moved to expand a law that banned public schools from teaching sexual education and gender identity.
Teachers who violate the law face being suspended or losing their teaching licences.
The David was completed by Michelangelo between 1501 and 1504. It was instantly hailed as a masterpiece, with Renaissance artist Giorgio Vasari saying the David "surpassed" any statue that had ever existed before.
Queen Victoria gifted a copy of the David to the South Kensington museum - later the V&A - in 1857. When she first saw the cast, she was apparently so shocked by the nudity that a fig leaf was commissioned to cover up the genitalia.
The V&A's website says that the leaf was kept "in readiness for any royal visits, when it was hung on the figure using two strategically placed hooks."
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