Dance teacher Sarah Lewis had sex with the 17-year-old pupil from Landmark High School, Utah
Sarah Lewis, 27, is said to have had sex with the 17-year-old at her home.
The blonde reportedly plied him beer and vodka before becoming intimate.
The session was captured on video but it it is unclear who recorded the footage, said police files.
The mum-of-one has been put on leave from Landmark High School, an alternative school in Spanish Fork, Utah.
Lewis, who also teaches social studies, has worked there for two years.
The dance teacher was charged with unlawful sexual activity and providing a minor with alcohol
Police said her alleged encounter with the student happened at her home in Payson at the beginning of the month.
Lewis has been charged with unlawful sexual activity with a minor and giving him alcohol.
Lieutenant Bill Wright said he understood the tryst was a one-off, but an investigation is continuing.
The mother-of-one has been put on leave from the school in Utah
"It's a tragedy that things like this occur," he told the Salt Lake Tribune.
"It's one of those mind-bogglers. You have to shake your head at it."
School’s spokeswoman Lana Hiskey said: "We really appreciate working with the police and them informing us quickly.
Her court hearing will take place next week
“Even though this is an extremely difficult situation, it's very unfortunate for all parties involved.
“We really appreciate the police giving us a heads up right away.”
Lewis is due to appear in court on Monday.