Jessie had already said that this was a "generous" bug that happened. But from what I understand from the new system you still have a drop rate.......umm, forget what its called......RNG???...anyways what they believe added was if you go for a month for example without getting a girl your drop rate goes up a bit till one drops. If another month passes the drop rate increases more. So on and so on. Once you get one, the rate go back to the original rate.
This is how I understand it.
-Shadow