Oh my, this takes me back...
I remember finding a "blank" video tape in my dad's dresser when I was putting his socks away and kept a mental note of it for later. When I finally had the house to myself I went back to check out what it was - it ended up being some late 80's / early 90's porn flick - straight, obviously. I was immediately aroused by what I saw but it would be a couple of years before I realised it was the man's cock that turned me on, not the woman he was slamming it into. They final money shot was a close up of the guy's cock shooting his load - it was the first time I had ever seen a man ejaculate, up until then I only knew about dry orgasms and didn't have a clue about ejaculation, so it was a bit of an eye opener!
I do remember one time when I was watching the video in the living room, my dad surprised me by coming home early from work. I barely had time to zip myself up, let alone get rid of the tape! I had to leave the tape inside the VHS player the entire time my dad was in the room with me watching TV and only managed to get the tape back into his dresser drawer when he eventually went to the bathroom for a few minutes.
To be honest, looking back on it now, I don't think he would have been too angry if he did catch me with his tape - probably just more annoyed that I went snooping through his stuff in the first place!