Hey, if you accidentaly choose the first option (i wont play your pervert games) and you back the dialogs until you arrive the choises again, it wont let you change it, thats why you cant select the other choice, you have to load a game before choosing or if you didn't save, you have to do all the route over again, hope it help (not native inglish)
PD: This will happen with all the choices in this version