My only issue really is the married man, did he at least tell his wife that he's "hiring" a lady on the side? As strange as it sounds I don't really have any big issues with the prostitution as long as both parties consent to it. My only concern is the married man's wife, I would like to at least know what's going on.
Maybe the wife is unable to perform her "wifely" duties so instead of the husband divorcing her he's keeping her around as long as he still gets some action on the side. I dunno, there are open marriages and it works for them, so whatever.