Submissives: when did you know?

[yoursinmine]

My first boyfriend picked me up abruptly, without any pretense, brought me to his truck, unzipped and shoved his cock in my face. He came really fast, then told me I better make him cum again before we got to his place. I didn't, and got punished. I was rock hard the whole time. That was a pretty good indication of what I liked. 

[RandyCubby]

I had an elementary school teacher who routinely HUMILIATED us kids. I knew even then there was something about being humiliated that excited me.