Having been thoroughly impressed with the free version, I paid for the premium one and have been enjoying it. EDIT: scratch my previous comment I worked it out. I have found a bug though - the game doesn't compute masc traits as something a futanari can have; no customers asking for a futa will ever ask for muscular bodies or huge cocks, and if you have a futa only brothel (as in, I set at the start to only have futas) and set (advanced) advertising for those traits, you will start getting customers for men.
On another note entirely - would you be open to the idea of allowing modding for the game? There are certain traits and events that I would be interested to have in the game, but I know aren't most people's cup of tea.