In some animals, male and female alike, the rigid, arched condition of the back will give way to such undulating movements as are sometimes seen in the act of coition.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
The symptoms of coition are so well known, that I shall not enlarge upon them; but if cows are confined to the house, there are some shy animals that require the greatest attention to detect them, while the majority are easily observed by their lowing and agitated appearance.
"Cattle and Cattle-breeders"
William M'Combie
She was not troubled by the slightest tincture of modesty, but philosophized on coition as coolly and much more learnedly than Hedvig.
"The Memoires of Casanova, Complete The Rare Unabridged London Edition Of 1894, plus An Unpublished Chapter of History, By Arthur Symons"
Jacques Casanova de Seingalt