Beauty is in the Eye of the Beholder
Dinosaurs aren't known for their good looks, but that's because we see them through a human lens. Even the species that appear ugliest to our eyes were beautiful to each other. Carnotaurs probably thought their freaky facial horns were sexy as hell. Pegomastax had a face that only a mother could love, and their mothers did. Therizinosaurs looked like a bunch of spare parts thrown together, but their success as a clade suggests they got laid a ton anyway. Beauty is subjective. Even dinosaurs knew that.