There's also the lube to the right of the statue on the floor in the bedroom! Bit hard to see because of the lighting, but I had something happen in my gameplay last night that the house wasn't as dark as it should have been, so I was able to see it a bit clearer.
Edit: didn't read thoroughly, but, I agree, could be clearer. Someone else could have missed the lube on the desk by never having done any of the miscellaneous study time. I honestly only knew it was interactable on my first play by trying to interact with the magazines the MC has out instead, lol.