I had a bud who let me take videos and still pics of him jacking off and showing off in general (very muscular/a looker and he knew it and was proud of it). He would also make videos of himself and give them to me. Nothing on the sly, he was very into showing off. We used to work out in the same gym and he would come up to me on a machine in a room full of people and start talking shit very softly, flexing and touching himself in a subtle way, knowing that I'd get an instant boner. Bastard, but I loved it.