I suggest you look, and try on a parachute harness at a 1-day tandem jump school. Then go to REI and ask the nice people there how to fit a climber's rig. IMHO, the chute harness will do nicely if you expect to try some unusual positions (upside down, etc.) but may block access to certain areas of the anatomy.
A climber's seat / rig allows the upper body to move more freely and basically anchors about / just below your navel. Depending on your partner's flexibility and how well you have it anchored, "sit and spin" is a real possibility -
Kids, don't try this at home. Get professional training. Results may vary. Objects may appear larger than they are.
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