I'm non-monogamous. I'm pretty flexible about the exact arrangement (because I'm bi and I'm ok with tailoring my approach to my partner's comfort level) but the only thing I really can't do is fullblown monogamy.
That being said:
Poly has severe complications that most people in it don't really advertise. High status, attractive men are much more likely to get partners. This can lead to a dynamic where an average looking male partner is theoretically allowed to date other people, but if he's honest with potential partners about being in an existing open relationship then the pool of women willing to date him evaporates. Meanwhile, his female partner ends up dating men that in a normal monogamous context would be difficult for her to attain, potentially destabilizing the relationship.
Then you throw sex into the whole equation. Reasonably good chance that you're not going be the best sex your partner has ever had forever. Or even if everything is great, you could be someone else's best sex ever, and it could destabilize their primary relationship and it could cause real hurt to both of them.
Meanwhile, less than average looking or low status men date even less than they used to. The whole incel movement will just get worse if the whole world goes poly because men are generally less picky than women and are happier with lots of casual partners.
This isn't always the case, of course. Some people can handle jealousy. Some people can compartmentalize different sexual experiences, but most humans struggle with it. Monogamy has a stability that I don't see as frequently with poly relationships. Though many people cheat, of course.
That being said:
Poly has severe complications that most people in it don't really advertise. High status, attractive men are much more likely to get partners. This can lead to a dynamic where an average looking male partner is theoretically allowed to date other people, but if he's honest with potential partners about being in an existing open relationship then the pool of women willing to date him evaporates. Meanwhile, his female partner ends up dating men that in a normal monogamous context would be difficult for her to attain, potentially destabilizing the relationship.
Then you throw sex into the whole equation. Reasonably good chance that you're not going be the best sex your partner has ever had forever. Or even if everything is great, you could be someone else's best sex ever, and it could destabilize their primary relationship and it could cause real hurt to both of them.
Meanwhile, less than average looking or low status men date even less than they used to. The whole incel movement will just get worse if the whole world goes poly because men are generally less picky than women and are happier with lots of casual partners.
This isn't always the case, of course. Some people can handle jealousy. Some people can compartmentalize different sexual experiences, but most humans struggle with it. Monogamy has a stability that I don't see as frequently with poly relationships. Though many people cheat, of course.