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Story highlights

"Senior Salute" allegedly encourages seniors to have sexual encounters with as many younger female students as possible

Owen Labrie, 19, has pleaded not guilty to charges that include rape of a classmate

(CNN) —  

Graduates of the prestigious New Hampshire prep school have included six congressmen, more than a dozen American ambassadors and U.S. Secretary of State John Kerry.

But a rape trial underway this week has brought unwanted attention to the elite St. Paul’s School in Concord, where a campus tradition known as the “Senior Salute” has come under fire for allegedly encouraging seniors to have sexual encounters with as many younger female students as possible.

Owen Labrie, 19, who has pleaded not guilty, is being tried on charges that include the rape of the 15-year-old student on the sprawling campus in May 2014 – just days before his graduation.

Labrie used the Internet and Facebook to entice and lure his victim into a sexual encounter, Deputy Merrimack County Attorney Catherine Ruffle said during her opening statement Tuesday. He allegedly told friends he had sex with with the girl.

The victim suffered injuries “consistent with a sexual assault,” Ruffle said. DNA evidence matched the defendant, she said.

“Did you use a condom?” the alleged victim asked Labrie in a message, according to Ruffle.

“Are you on the pill? I think you’re OK. I put it on halfway through,” the defendant allegedly wrote back.

Carney said the “Senior Salute” is a decades-old school tradition that could involve “kissing or hugging.” Some salutes are not sexual in nature.

“If they kiss a freshman, sophomore, or junior, it could be a ‘Senior Salute,’” he said. “It was a competition. How many girls can I have kiss me or be with me?”

Being invited to participate in the salute was a “source of pride” for younger students, Carney said.

Carney said his client told police he kissed and hugged the victim but did not have sexual intercourse with her. He read messages that he said proved the girl willingly participated in the encounter.

“There’s a door here that’s been locked since before we were born,” Labrie wrote in one message. “If you want the definition of bittersweet, think of me spending three years trying to open it, but only having three days.”

She declined at first but then changed her mind.

“Only if it is our little secret,” she wrote.

“Not a soul needs to know,” Labrie replied.

In another message, he wrote: “You’re a gem. Let me know if there is anything I can do.”

“You’re not too bad yourself. I will. I also lost my earring up there. haha,” she responded.

The alleged victim took the stand Tuesday; her testimony resumes Wednesday.

In a statement, St. Paul’s Rector Michael Hirschfeld said, “We do not tolerate conduct that is at odds with our commitment to a safe and welcoming environment for everyone in the St. Paul’s School community. Current allegations about our culture are not emblematic of our school or our values, our rules, or the people who represent our student body, alumni, faculty and staff.”

The residential Episcopal high school, where tuition is $52,000 a year, was founded in 1856.

CNN’s Ray Sanchez contributed to this report.