A particular form of Our Fairies Are Different, namely a pixie that's young, female and attractive. Doesn't generally wear too many clothes, sometimes just leaves or flower petals. If the fairy is far smaller than human, Fridge Logic may ensue. The trope has at least some historical basis going back to Greek Mythology, where just about every Nymph was Ms. Fanservice (and got raped a lot). Examples of Fairy Sexy include: