Do you think people are polyamorous/monogamous like they are heterosexual/homosexual, so it's inherent, or is this a choice?

As I myself am very much still debating this and science has not yet investigated this properly, I'm very interested in your opinion.

Inherent
Choice
It's not that simple (& I'll explain in the comments)
Select gender and age to cast your vote:
Do you think people are polyamorous/monogamous like they are heterosexual/homosexual, so it's inherent, or is this a choice?
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