I'm wondering just how common my cats are in the use of their tails, as I've not noticed this in others much.
They both have decent length tails, Boycat's especially (would trail along the floor if he let it dangle completely & he's quite tall), and they seem particularly expressive (prehensile is a word that comes to mind). We aren't just talking about swishing or twitching, or moving to help balance, but they actually seem to use them to caress each other.
My cuties may not be the cuddliest around, but when they are begging for food or treats they wind round each other doing the head rubbing thing, then they will use their tails to stroke down each other's bodies and sometimes entwine their tails then go back to stroking each other with them - something I've never seem before.
I've also noticed that despite being shy and nervous in general, neither has much of a problem with me stroking and playing with their tails; I had been under the impression that cats tend to be more uncertain about their tails being played with than other bits in general, but not mine.