A 59-year-old man who promoted prostitution services offered at six massage parlors has been sentenced to 15 months in a federal prison.

U.S. District Judge Christine M. Arguello also sentenced David A. Warmack of Denver to three years of supervised release, according to a news release by U.S. Attorney John Walsh and FBI Denver Division Special Agent in Charge Thomas Ravenelle.

“Warmack systematically perpetuated the victimization of the workers at these parlors, and he obstructed justice to boot,” Walsh said in a statement on Tuesday. “This turned out not to be a great strategy, thanks to the exceptional work of the law enforcement and prosecution team that put this complex case together.”

From August of 2011 to July 2014, Warmack promoted and facilitated prostitution liaisons through a website business named sowet.com.

Warmack charged fees to massage parlor owners of Happy Feet of Golden in 2011 and 2012; Sunday Spa in Aurora in 2012 and 2013; Jewell Spa of Lakewood in 2012 to 2013; Abalone Spa of Wheat Ridge in 2013; Maize Spa of Aurora in 2013 and 2014; and Hill Relaxation Spa of Parker in 2014, according to the news release.

Warmack traded positive online reviews and sexually suggestive photographs of women on his site of some of the parlors in exchange for sexual services.

He collected from $150 to $400 a month from each of the parlors.

Warmack’s website offered tips about how to handle law enforcement questioning. He admitted he gave false information to federal agents and before the grand jury in 2009, and again in 2014 after FBI agents arrested him.

“The defendant engaged in widespread, systematic exploitation and victimization of vulnerable women for his personal profit and pleasure. While he advertised the so-called spas online, he acted as a pimp, contributing to the vicious cycle of abuse and degradation of the women through prostitution,” Ravenelle said.

He credited work done by law enforcement agents from state, county, local and federal agencies across the Denver area.