We need to determine if the house offers any specialties. These will increase the price if the customer wants to take advantage of the specialties. The chance of specialties being offered depends on the number of courtesans in the house, as larger houses can offer more variety. The chance of special services being offered is (20 + ( 3 x courtesans) ). In addition, there is a 5% chance that the house of ill repute only offers special services, and doesn’t offer the “standard” service around which the 3gp base cost has been set.