After allegedly having sex with a 15-year-old girl he met on Tinder, a Holton man is facing felony sex-crime charges.

On the night of March 15 a police officer patrolling Lawrence noticed a white car parked after hours at the Prairie Park Nature Center, 2730 Harper St., according to an arrest affidavit filed in Douglas County District Court.

Inside the car the officer found a 20-year-old man sitting alongside a girl who claimed to be 17, the affidavit says, but when the officer asked when the girl was born “she appeared to be trying to count out loud to herself.”

An arrest affidavit is a sworn document filed by police explaining the reasons for an arrest. Allegations in an arrest affidavit still must be proved in court.

Noting that she was nervous, the girl then admitted that she was 15 years old, the affidavit says. She also added that she and the man were just friends and were only talking.

When questioned further, the man told police that he met the girl on the dating application Tinder and that they later became friends on Facebook, the affidavit says. This was the first time the two had met in person, he said.

Later interviewed at the Lawrence Police Department’s Law Enforcement Center, 111 E. 11th St., the man admitted that he knew the girl was 15 and said that she had sent him sexual pictures, though he did not send any of himself in return, the affidavit says.

The man then told police he did have sex with the girl in his car and was preparing to drop her off at her parents’ house when they were contacted by the officer, the affidavit says.

The girl was also interviewed by police and said she and the man had sex before, the affidavit says.

The man was arrested on July 9 and released later that day after posting a $15,000 bond. He faces felony charges of aggravated indecent liberties with a child and criminal sodomy.

A preliminary hearing, where the man will be able to address the allegations in the affidavit, is scheduled for Aug. 31 at 2 p.m.