Gullivers Travels by Part 4 Chapter 7 Page 19

Perhaps my master might refine a little in these speculations, which he had drawn from what he observed himself, or had been told him by others; however, I could not reflect without some amazement, and much sorrow, that the rudiments of lewdness, coquetry, censure, and scandal, should have place by instinct in womankind.

I expected every moment that my master would accuse the Yahoos of those unnatural appetites in both sexes, so common among us. But nature, it seems, has not been so expert a school-mistress; and these politer pleasures are entirely the productions of art and reason on our side of the globe.