And, granted, "My luve is like a red red dragonfly" doesn't have quite the same ring to it.
But color.
"My love's eyes are nothing like the sun, coral is more red than her lip's red." (Thanks, Billy, for that sonnet, number 130). She didn't have access to a cosmetics counter, poor creature, or the fiver to spend on such cheering frippery as a fresh tube of lippy in, say, "Poppy."
Still, it's red I'm seeing. Literal red –– scarlet and blood-red, crimson and carmine, vermillion and cardinal and ruby –– not metaphorical red, though describing it brings me full circle back to what's the reddest thing in the world.
Check the color on these babies: