Just be polyamorous (see e.g. https://polyfidelity.org.au/about/polyamory/education/121-th..., http://slatestarcodex.com/2013/04/06/polyamory-is-boring/).

If there is a need to have multiple partners instead of going the "traditional way" (one official partner + cheating or some shady don't ask don't tell arrangement) it seems much healthier to openly discuss needs and boundaries. We shouldn't just accept "system defaults" if they are not optimal for us.

In my local poly community (Warsaw) there is a lot of nerds. I tend to view it as a hacker's approach to relationship.