sexual desires at age 5?

Now the reason I'm asking is because the other day a memory for when I was a child popped up: I remember when I was a little girl (probably between ages 4-6) I used to lie on the floor, wrap myself in a blanket & roll around like I was being kiddnapped almost. I would feel this urge, but I didn't quite know how to satisfy it. I wasn't sure what it was or why it happened. Looking back on this it was a sexual kind of urge, but I was so young that I didn't understand that. I don't even know if it's possible. But if it is it might make some kind of sense. I started masturbating and watching porn at a very young age and have been very sexual. I don't know why but I guess I've always found the idea of being tied up and almost sexually tortured pleasurable. Not to the point of actual physical pain, but the resistance and dominance I guess.