I've avoided the last couple gen's of the game, is it still logic flawed where it insinuates sex has been part of MC and Dana's life before you flip the right set of switches? It even suggested one night you spent together, without any scripted sex, later on that you did.
In one play I shared her the first time with the couple, then the next I didn't and it made references to us having had sex before in the game.
Seriously, writing a couple alternate lines with a variable can't be that hard. It is minutes and does not require art.