I don't know all of the paths, but I can tell you that the Depravity path comes to kind of an abrupt end. If you're on it, Nadya asks if you want to blow off class. If you say yes, you wind up on the Netori path. If you say no, you later get forced on to the Futa X Futa path.
I don't know what the current plans for the Depravity path are at this point, but I'm not interested in Futa x Futa, and also the transition is a little awkward because parts of the Netori path refer to events earlier, but they are before you make that choice. Milly only throws the condoms away if you were on the Netori path the whole time, and she refers to losing her virginity in a gym room. If you were on the Depravity path and then swapped over, it happens in the library.