Do guys really hate monogamy?

No. I don't believe many men hate monogamy. But I do think that depending on how a man is socialized and to the extent that a man learns to develop healthy boundaries around sexuality, that is one determining factor the degree to which a man can exercise monogamous behavior.
Interesting question. That's an interesting question. There are those who argue that both men and women are "wired" for promiscuity. My own observation is that most people eventually aspire to have an exclusive someone with whom to share their life. Conventional wisdom has it that men are more likely to stray, but more recent research shows that men and women are increasingly similar in their tendency to cheat.