Ian's scenes tend to be more developed, full scale sex affairs, while half of Lena's is "blow some guy in a bathroom or wherever" so it's not exactly the same in terms of how easily they get produced and added. (then there's also lesbian scenes, like MixQQ brings up)Can't help but notice that the gap in number of scenes for Lena vs Ian keeps getting larger and larger with each update. Although, I shouldn't be surprised given that dev's previous game was FemMC only.
I don't think many players would be enthusiastic with option for Ian to blow random dudes from the male cast in the bathrooms, to even the count