When Did You Have Your First Experience With BDSM?

The title says it all.:) At what age did you have your first BDSM expirience, what was it and how did you expirience it? I was 19 when my girlfriend first gave me a klysma. Not so special maybe, but that was my first expirience. It was a strange feeling, afterwards I felt tired or something like that. A little bit a sad feeling. I still have that same feeling, sometimes.