Is it normal to orgasm after seeing your first pair of real boobs?

I was in New York City yesterday, and I still can't believe what I saw. There was this woman walking topless down the sidewalk, and she went right past me. She was smoking hot, and her boobs were amazing too. She looked like a model, no joke. My dick rubbed against my boxers once, when I took a step, and I cummed. Do I have weak resistance?