We assure you no fairy was vivisected in the making of that image.
I didn't delve into things like elemental colors and howthe physical elements of the body interact with soul energy, because it would get incredibly tedious. Just roughly think of it as photosynthesis & melanin, but for magic.
And no, fairies don't have 4 heartbeats. The hearts are in sync, so it's just two loud ones.
And yes, fairies can basically orgasm 4 different way: With the clitoris, the tail, vaginal stimulation, and prorum stimulation in the butt. Making all 4 happen at the same time almost guarantee the fairy will faint from pleasure overload. Sounds like a job for Zak!