A South St. Paul man will spend 90 days in jail and faces three years of probation for lewd exchanges on a messaging app with an undercover officer he believed to be a 15-year-old girl.

A Washington County court on Oct. 25 sentenced Carl William Gansen, 34, for felony engaging in electronic communication describing sexual conduct with a child.

According to a Washington County criminal complaint, Gansen was one of several males to respond to a post on the anonymous app Whisper.sh posted by an undercover officer posing as a teenage girl advertising paid sex.

During an April 2016 exchange, the complaint states, Gansen said that he "loved" young girls, but said "it was a risky deal because sometimes it turns out to be cops looking for pervs."

After seeing a fictitious picture of the girl with whom Gansen believed he was messaging, he agreed to pay $100 for sex and arranged to meet at a fast food restaurant in Woodbury several days later.

Gansen, according to the complaint, arrived at the restaurant with $200 cash in his wallet.

Police arrested him at the scene.

The complaint states Gansen confirmed his Whisper username with the police but offered no cohesive answer for why he had been describing sexual acts with a juvenile.