I just spent a half hour explaining my vote and all kinds of deep old memories and the post disappeared.
Anyway, I voted for the earliest memory category.
Nutshell version why:
I remember being 3 or 4 and longing for my cousin's girlfriend who was about 18 or 20. I was feeling sexual desire, though I didn't know what it was at the time of course, just an intense feeling that I needed to be around her and touch her. I wanted to hold her hand, kiss her, protect her, and be her hero.
I had similar crushes on many many girls and young women - used to cut wildflowers for them, and crawl onto their laps to put the flowers in their hair. I remember wanting to marry them.
But I didn't know there was anything unusual about feeling that way for your own sex until I was 6. That's when I became aware of the gay marriage furor. It took me about 15 seconds to recognize what was going on there, and I remembered that I would grow up to be an activist. Well except that when I was 6, it was such a long time til I would turn 18 I was 95% sure gay marriage would be legalized long before I reached 18.
Anyway, it was that moment when my friend told me about the gay marriage stuff , that I said to myself, "Well, I am going to marry whoever is the most spiritual partner - whether it's a man or a woman." Which, as far as I'm concerned, means that I knew I was bisexual already before then. Too bad for the internal homophobia that followed and made me go round in circles about my orientation for years and years.