In the thread below, someone asked where one meets mistresses.   For this married man, the answer was simple, I met her in a strip club.  And I propositioned her and made her my mistress because she has the gorgeous face and killer body that I have been dreaming about my whole life.  

My advice is that if you want a mistress you have to aggressive about making known your desires.  I can't talk at all about the civvie world, but in the world of providers and strip clubs, it is the only way.