The key to that is to do, in different cycles the porn date and the sleeping together. Inside them are the two unlocks for Alex C2. If you need more information there is an in game guide just below the conversation map that will track it all for you.
I believe I see what's going on. The condition to unlock the porn scene about getting her off also happens in the shower. So you bring up the porn then you get her hot and bothered and she will bring the porn back up. I'll also double check things on my end.
