Okay, I asked the question, I should answer, shouldin't I? More (much more,) than twenty-one.
We had our first night at a swinger club on Nov. 30, 2002. By Feb. 15, we had been in situations with twenty-one partners. (Either foursome swaps which I counted as one, orgies where I counted the guys who had Mary, or threesomes.) We never slowed down that first year, and kept going for years and years - some slower than others, but we never stopped.
Also, I'm confused about the 'other' votes. Yes, couplers, you explained and I thank you for that. But I'd be interested in why some picked 'other' rather than a specific number.