She added that he was not at the flat full-time, but would come for his "regular cut".
Police also seized bundles of pornography, sex toys, whips, condoms and outfits from the home.
Prosecuting at Glasgow Sheriff Court, Andrew Haughney said it became clear the flat was now "a home of sexual entertainment".
He added: "From that first phone call, it appeared sex was being offered at a price with a girl of the caller's choice."
O'Hara, a married man with two children, was interviewed at his home in Priorwood Gate, Newton Mearns, but made no comment.
But in court, he pleaded guilty to running the brothel although he claimed to have made little from the venture.
He told police that he had got involved after discussing with "other men" how he could boost his £150-a-week wages.
Sentencing, Sheriff Brian Lockhart said custody was the "only sentence he felt fit for such an offence".
He added: "I have given great consideration to what I have heard and this type of behaviour has left me with no other option."
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