Is monogamy morally bad? Hey, I'm new to the forum and I just discovered this topic. I found it really interesting to read, and I would be pleased to participate in this search for knowledge, although I do not know how this topic is. It is also important to state that I'm Brazilian, so my english is not that advanced when it comes to writing...
unenlightened brought a very important point on: this discussion is widely present in femminist movements, specially those connected to marxist theories. I've read many texts questioning compulsive monogamy as both a manipulative tool. A powerful sexist (women are usually depicted as the cheaters of the couples) and capitalist tool used by big company groups that want to maintain their moral beliefs. If you think this way, in which monogamy is injected in your head through cartoons, movies and books, and you believe in the inalienable right of freedom of thinking and acting (what Rousseau and other french philosophers of the eighteenth century used to talk about), then yes, it is morally incorrect. But if you believe that culture is a intrinsecate trait to the human being and no manifestation of it in any context is incorrect, then no.
And if you're feeling worried by this, be sure that you're not the only one. When coming to taste, I'm a hopeless romantic, who writes about his beloved ones and likes to read Keats, Wordsworth, Byron and Brazilian writers such as José de Alencar and Álvares de Azevedo. No wonder that I would love to be in a monogamic relation.
But I try to keep my mind open, and do want to talk to someone who have the same worries.