No definitive answer. Agree with Dr. Chen; impossible to tease apart how much is due to upbringing, life experiences (e.g., learning), or other environmental factors vs. genetics. There is some belief in the scientific community that humans evolved to be monogamous. So, genes likely influence monogamy, but humans are extremely flexible in terms of how they behave in different contexts. Hope this is helpful. Take care.
Monogamy. I'm not aware of any research in this area. I think monogamy has a stong cultural component. I don't think there is a clear answer to this question. I'm sure there are a wide variety of opinions.