Kissing your boyfriend's ears...?

I've never done this until tonight. At first, we were just playing around. I was talking loudly in his ear to annoy him, actually. I don't know why, but I had the sudden urge to start kissing his ear. So I did... closing my lips around his earlobe and touching the edge with the tip of my tongue. He got chills all over his arms and legs. Does that mean he got turned on or it's just a ticklish spot?