I first masturbated at 12. Whereas I found this fun, I needed to seek to outside involvement. Unfortunately, I was still coming into my own and really had no way to get laid. I was, of course, jacking off like a spider monkey but did something I really rather regretted later. My sister had a German Shepherd that I would flip over on the bed and whereas I would not actually penetrate her I would rub my cock against her until I came. She would understandably be extremely disturbed by the situation.