I don’t know either, but these folks are trying to find out. If you identify as polyamorous and would consider participating in a research study investigating a potential genetic influence on polyamory, check out the information below.
Polyamory Personal Genomics Study
The citizen scientists over at DIYGenomics are recruiting volunteers for an opt-in genomics study on polyamorous participants.
Melanie Swan is coordinating the study, so if you’re poly, have some 23andMe [DIY genetics] data, and are up for contributing to science, you can contact her at firstname.lastname@example.org .