Could be it, but wouldn't this voters like the men who participate or cause the corruption aswell?Maybe voters really like corruption of female characters. So seeing Cindy be made to cheat or Holly become more sexual or Lena's many corruption paths are all the things that are popular. Ian then is just a means to an end to see the corruption, so that's why he isn't popular to these voters.
If the most important thing is the corruption of the female character then they could vote for both MCs. The thing is if the story that you get most invested in is the one with cindy then in this game your favorite protagonist to play should be ian, no?