TOPEKA, Kan. (AP) — A 46-year-old man has admitted to conspiring to operate a prostitution business based in Topeka.

Sean Hall pleaded guilty Monday to one count of conspiracy. Acting U.S. Attorney Tom Beall says Hall was part of a prostitution business that at times used up to 20 females, some of whom lived in houses rented by the organization. The conspirators used Web sites, social media and cell phones to advertise sexual services and to keep track of prostitutes.

Hall will be sentenced Oct. 3. He faces up to five years in federal prison and a fine up to $250,000.

Co-defendant Frank Boswell, of Topeka, is awaiting trial. Co-defendant Rachel Flenniken, also of Topeka, pleaded guilty earlier this month and will be sentenced Oct. 17.