What can I say.......I am a genius..!!!!
Now, coming to your damn doctor first, why is he giving you such a medicine? At 24 you are supposed to be a rogue elephant in hit, willing to drill a concrete wall if nothing else is available!! Does the doctor has a bombshell wife, or a young daughter, maybe a hot sister, and you hinted at any of them previously?? Why the hell that doctor is doing this to you, this is worse than ISIS nutjobs cutting your head.......I mean a man can live without his head....but....but.....!!
Second, with all due respect, please ask your father to give you some space and privacy, this is not the way he was brought up, otherwise you wouldn't be existing today! Remind him about his young days, maybe gift him a DVD of "American Pie - Part-l" for educational purposes......and ask him to leave you alone with some privacy to do your.......your......thing!!

Ask him to do this for the sake of his might-not-happen-grandchildren!!
Third, what kind of a 24 years old still-a-guy can't hide some good nice highly educational (and in your case medicinal) video clips from his father, you are technologically far more advanced than him, right? At your age we used to hide whole books, magazines, video cassettes, even full-sized 5+ feet girlfriends from our parents, damn!!! You need some good training, and some bad company of very naughty but normally functional guys....damn!!!