I don’t know how I feel about the idea, but it is basically slightly more organized partner-swapping.
In any case, the term “marital Zipcar” will likely stick with me for a while.
I think the basic idea already slapped your brain with either awesomeness or disgust (no middle ground is possible, I asset!), so the question is obviously whether it would be a concept worth discussing, as polyamorous people?
I am not sure, but it did make me think about it as swinging for poly people; as in, we have our little poly family over here, and so do you all, so let’s mix up and see who might be interested in swapping a partner or two here or there occasionally. Rather than “monogamous swapping” (really, it’s not monogamy if there is sharing of sexual partners) among couples, it is swapping among groups of people who tend to be too busy to go out and look on their own for a little variety.
Sort of like a hybrid between polyamory and swinger communities. Swingers tend to be couples who play with other singles or couples, polyamorous people tend to be more relationship oriented. And, of course, some poly people do a fair amount of interconnecting between poly groups, but rarely do orgies break out (in fact, outside of specific parties which are designed to create such things, I have not seen this appear spontaneously).
So, would a “poly Zipcar” be a variation on polyamory, or would it just be swinging?
I guess the question depends on how we distinguish polyamory and swinging; as a qualitative difference or one simply of relationship versus sexual orientation.
In any case, one of these days Ginny and I will have to re-construct our attempt to graph the dimensions of differences between swingers and polyamorous people; it involved (if I remember correctly) at least three axes!