(If this isn't the right section, please move it. I thought this could be a serious discussion for the Lolicon folk here.)
Myself .. Well, I honestly have no clue when I became a Lolicon. Is this one of those things that you're born liking, and just discover it later in life? Or is it something you develop later on from personal taste?
I think one factor that told me was when looking at this, I became aroused.
Like I said, I'm not sure when I "became" a Lolicon. I hope that isn't too confusing.
Like the thread asks, when did it happen to you?