When I was in the service in the 70's, guys who were back from 'Nam told us that a "basket fuck" was an option available at most brothels there. I assume this is the same thing.

As it was described to me, the guy lies on his back. The girl sits in a large wicker basket which has a opening in the bottom aligned with her crotch. The basket is suspended by a rope from the ceiling.
After the guy inserts his cock, the Mama San spins the basket. The rope winds up, raising the basket slightly. Eventually the basket begins to spin in the other direction, lowering slightly and then raising again.

It was never actually clear to me if you could cum from this, but I am sure the sensation is unique, especially if the girl knows how to squeeze her cunt muscles.