In my case, what unlocked my official girlfriend was saying yes when she offered me a ride home. I don't know if that really matters, but I'm mentioning it just in case. Also, make sure you listen to what he or she asks of you in sex, especially when it comes to where your partner wants you to cum. If they ask you to do it outside and you don't have enough willpower, go back in history and make sure you change positions or whatever to cum where they want you to. Again, I don't know if this plays a role, but I was actually violating that part without knowing it. 😬