Its much easier to fulfill a partners needs if they tell you what they want, rather than making you guess. Open relationships allow partners to put all their cards on the table. Open relationships also allow non-monogamous people to express their needs and identity without fear.

How does an open relationship work?

In a nutshell, an open relationship means you still have one primary partner but both can have other sexual partners. Polyamory means you have multiple relationships that are both emotional as well as sexual. There is no primary.