Why do girls get turned on by kissing on neck?

Well, I've only had it happen once but it really turned me on. I think it's because it was gentle and normally it's add on to something else e.g pussy fingering or just a sexy touch. If you think about it that area is quite vulnerable (lot's of blood vessels), maybe it's a whole they make me feel safe thing. What kind of heavy breathing do you mean by the way?

When you kiss such a sensitive area it shows you take pleasure in loving and giving pleasure - so it's a turn-on physically, mentally and emotionally.
Heavy breathing can be a symptom of arousal, but all women show their excitement in different ways.
There's no template that fits all women or all occasions.
Let your awareness of her responses guide you.
If in doubt, ask.

Makes their hoo-ha do a little rain dance. 😕

Its just one of the bodies erogenous zones.

It's a weirdly intimate place to be kissed, maybe because it's such a sensitive place, especially on the side or in the back. If it's in the back, it can feel a little ticklish, but nice. :)

Omg that is hot. Doing and receiving

Because it feels really nice.

I've had women kiss me on the neck.. I mean it's ok.. but quite frankly it tickles me then I ruin the mood laughing Soo lol