Ting Low, aged 34, pleaded guilty at Warwick Crown Court to assisting in the management of a brothel in Albion Street in September 2014.
She also pleaded guilty to assisting in the management of a brothel in Pool Bank Street, Nuneaton, between November 2013 and September the following year, and one in High Street, Leamington, between September 2013 and June 2014.
In addition Low of High Street, Ongar, Essex, admitted similar charges in relation to brothels in Alfreton Road, Nottingham, Tor Hill Road, Torquay, and Granville Place, Finchley, London, on dates during a five-year period between 2010 and January last year.
Low also pleaded guilty to two other charges relating to money laundering.
Low was one of six women and two men who were in the dock at Warwick Crown Court.
Tracey Chan, aged 44 of Forton Road, Gosport, pleaded guilty to keeping or managing the brothel in Nottingham between May 2014 and March last year.
Chailuan Lim, aged 50 of Wesgate Court, Reading, pleaded guilty to an identical charge in relation to the brothel in Torquay, which operated between August 2011 and September 2014.
The case against Low, Chan and Lim was adjourned for pre-sentence reports to be prepared on them and they were granted bail.
But Recorder Kevin Hegarty QC pointed out they would not be sentenced until after the trial of the other five, which has been set for next March.