UPDATE May 7: Thomas Zachary Rouse was sentenced to four years in prison, as outlined in his plea agreement.

The former director of Portland Parks & Recreation's tennis program pleaded guilty to child pornography charges Wednesday after police say he enticed underage girls to send him naked photos of themselves during X-rated online conversations.

Thomas Zachary Rouse, 44, also sent a sexually explicit photo of himself to at least one of the girls, police said.

None of the girls were associated with the city's tennis program, authorities said.

The girls said they were between ages 14 and 17, and Rouse said he didn’t mind if they were younger than 18, according to online conversations obtained by police.

Rouse is expected to be sentenced to four years in prison next month as part of a plea agreement.

He admitted to accessing naked photos of two of the girls and trying to view naked photos of two more of the girls. He pleaded guilty to two counts of second-degree encouraging child sexual abuse and two counts of second-degree attempted encouraging child sexual abuse.

Rouse, wearing a blue jail uniform, made no statements in Multnomah County Circuit Court.

Portland police learned of Rouse’s crimes after an adult hook-up website, Fling, reported him. A police search warrant affidavit says other users on Fling were complaining about Rouse, with one posting: “THIS MEMBER MUST NOT BE ALLOWED BACK ON SITE EVER.”

After his arrest, Rouse lost his job as supervisor of the Portland Tennis Center in Northeast Portland and director of the city's tennis programs. As part of his job, he oversaw the use of more than 100 courts throughout the city. He'd held the position for more than a year.

Rouse met the girls online in 2014 and 2015. They all lived outside of Oregon.

In a police interview in October 2015, Rouse claimed his online conversations with the girls were all fantasy and he thought he was talking to people who were at least 18 years old.

In one conversation with a girl who said she was 14, he asked if she was a virgin.

“I want to own that young teen body,” Rouse said, according to a transcript of the conversation.

Rouse told detectives that he’d never met up with any of the people he spoke to online.

“All of that is just make-believe stuff,” Rouse said. “I’ve not done anything with anybody.”

Detective Cory Stenzel responded: “I really hope that’s true because ... I’m going to scorch the earth finding out if there’s victims out there.”

Police and prosecutors ultimately found no evidence that Rouse met any of the girls.

Rouse already has served two years in jail, and he will receive credit for that time when he goes to prison. The agreement also requires that he receive sex offender treatment and register as a sex offender for the rest of his life.

-- Aimee Green