First BDSM exposure?

What is your first BDSM literature you encounter with? Or is anyone not going to venture and read this? Do you like it or not? What makes you think so?

For me, my first encounter was not even about straight couple stories. I unknowingly read
*****minors please do not read this when you cannot handle blood, needles, non-consensual, etc.***** Hoshi no Yakata (Tori Maia)

What I like about that manga was the emotion, expression and the stories of each characters on there. It made me change my mind about relationships and I suppose that made me accept how weird everyone is? Is that even makes sense?

I'm sure most of you guys introduction to BDSM are from 50 shades, so please be careful and prepare your mind when you want to start reading that story ^^