I was once. The current depth of my sensitivity has not been plumbed for some time.

Depends on who is tickling

Yes

From head to toe

Terribly, yes...

yes, it's brutal

Yes!

yes around my neck

Incredibly so - post-coital, it intensifies so much I can't bare to be touched for a couple of minutes

The bottoms of my feet are the worst!!

In the neck😖