Narrator: PROBLEMS THAT CAN ONLY BE BLAMED ON MONOGAMOUS COUPLES:

T-Rex: Cheating on your sweetie!

Dromiceiomimus: Actually, T-Rex, non-monogamy doesn't automatically mean "now you can have sex with everyone without consequences", it usually means "I'm not going to demand exclusivity of you, but we still need communication and trust, and, as in any relationship, I can be hurt". You can still cheat. We talked about this.
T-Rex: Oh YEAH

Narrator: PROBLEMS THAT CAN ONLY BE BLAMED ON NON-MONOGAMOUS RELATIONSHIPS:

T-Rex: Monogamous folks questioning what had before been the default assumption of exclusivity!
Utahraptor: Difficulty in finding monogamous partners, if everyone else wants piece(s) on the side(s)?
T-Rex: Too many sexy times with too many sexy people!!

T-Rex: That is a problem I have never experienced but which I must believe exists. I CHOOSE to live in a world where this could one day be my problem!
T-Rex: I CHOOSE to live in a world where one day all this sex could stress me out, seriously interfering with my work and productivity