have you equipped it? All of the scenes atleast show the benis module if it can be seen. As for unique scenes; You can use the benis module on Raider Sharpshooters, Marys, Gloria(Boss). Mary also has a unique lewd attack if you have it equipped.
I have equipped it, it says it equipped and it doesn't show, I seen a lewd scene with the robot lady expert, it doesn't show.