Growing up in a small mid-western USA town, it never occurred to me that a penis could make you feel good. Then it happened:
Steve, my neighbor friend, told me that if I wanted to feel real good, I could rub my penis through my pants. Later that day, we sat on the floor by his bed and rubbed and rubbed. I never did cum, but the feelings were great.
Later in the week, he called me up and told me that he had something to show me. When I showed up at his house, we went directly to his room where he showed me a device that he called a vibrator. He said it was his mother's. It had a little cup on the end that, indeed, vibrated when you turned it on.
Once again, we sat by his bed and administered this device on our crotches until we heard his mother come home. It felt even better than the rub method, but again, I just didn't know enough to keep going. I would always stop before the feelings became too intense. The 'thud, thud, thud' of my first orgasm would come later...