Born into it. Both Mom and Dad rode. Heck Mom and Dad met at Motorcycle club meetings, no not Sons of Anarchy, they were the Road Knights of Philadelphia, mostly Glenside. Mom's Dad, my grandfather is in the motorcycle Hall of Fame (http://www.oriesteele.com
is the website I created about him) he rode factory Indian hillclimb and won a ton of races from the teens up into the 30's.
My father worked at a Harley dealership for years. When I was about 5 he brought home a Bronco 50cc minibike. He showed me how to use it and the next day I proceeded to ride it into the side of the house. Mom was less than pleased. The minibike went away for a while, then about a year later it came back. When I grew out of that I got a '69 Aeromacchi Harley that I beat around the woods. Then a 500cc Triumph thumper. My first road bike was a Triumph Bonneville, then I got my first BMW, and then another, and another.