For me it was the old JC Penney catalogs-it was the early 80's so there were both traditional white briefs and jocks, as well as the new colored briefs. I was about 7 and I knew I liked what I saw. Then I found Playboy, Penthouse, and Playgirl under my parent's bed. Seeing the dicks in Playgirl I knew I was hooked. Mom switched dad and my brother and I all from white briefs to colored briefs. Started noticing dad's bulge when he walked around the house in his briefs. I remember when my older brother got his first jock, and seeing the box from that Bike jock under his bed. Felt so naughty looking at how it bulged. Was masturbating regularly by the time I was 8.