Babe: "Only for a few minutes this time, it gives me a headache."
Not the gymnastic activity. Rather analogous to the wheel of a cart.
Hot version: Woman seated atop a man, with his erect penis in her vagina. She straightens her knees and puts her legs forward at angles, like the spokes of a cart wheel. She may do the same with her arms, as though they were spokes of a second wheel. Then her partner (or, better, one or more other persons) rotates her with the penis acting like an axle. Success may depend upon the physical attributes of the persons involved.
Extra hot version: Gender here is less relevant. The erect penis is in the rotating partner's rectum.
Super hot (but extremely difficult) version: Two penises are involved at the same time in the same orifice. Variant: Two erect penises act like two ends of an axle, one taken orally, the other below. Some contraption, such as a netted hammock or a board with a hole in it, may be necessary to suspend the top partner. Most easily performed, given some practice, in a zero-gravity environment, in which case anchoring of the partners serving as axles will be necessary.