What's your favourite implement to write about? Read about? Give? Receive? (For those of you who give and/or receive for fun in your adult lives)

And why?
My favourites:
1. To receive: hand. Second-fav, belt. (Because both of them have the potential to feel light and erotic, or alternatively brutal and barbaric, depending on how hard we're going for here.)
2. To give: wooden hairbrush. (Because it has a very high effect to effort ratio. Yeah, hurts more than you thought, doesn't it? That first-time yelp of surprise never gets old...)
3. To write and read about: same as above. (Because, well... it's what I know. And when I read, I like to be able to easily imagine what it's supposed to feel like. However, I also enjoy good descriptions of what it feels like with some object I'm not familiar with, so there's that too.)