The latter position is recommended by Ovid to the woman with rounded thighs and faultless figure:
“She that has young rounded thigh and flawless bosom, should ever lie reclined sideways on the couch”[[14]] (Art of Love, II., v. 781, 782).
Copulation face to face with the woman sitting obliquely is described by Aloysia Sigaea with her usual elegance and vivacity:
“Caviceo came on, blithe and joyous” (it is Olympia speaking). “He despoils me of my chemise, and his libertine hand touches my parts. He tells me to sit down again as I was seated before, and places a chair under either foot in a way that my legs were lifted high in air, and the gate of my garden was wide open to the assaults I was expecting. He then slides his right hand under my buttocks and draws me a little closer to him. With his left he supported the weight of his spear. Then he laid himself down on me ... put his battering-ram to my gate, inserted the head of his member into the outermost fissure, opening the lips of it with his fingers. But there he stopped, and for awhile made no further attack. “Octavia sweetest”, he says, “clasp me tightly, raise your right thigh and rest it on my side.”—“I do not know what you want”, I said. Hearing this he lifted my thigh with his own hand, and guided it round his loin, as he wished; finally he forced his arrow into the target of Venus. In the beginning he pushes in with gentle blows, then quicker, and at last with such force I could not doubt that I was in great danger. His member was hard as horn, and he forced it in so cruelly, that I cried out, “You will tear me to pieces.” He stopped a moment from his work. “I implore you to be quiet, my dear”, he said, “it can only be done this way; endure it without flinching.” Again his hand slid under my buttocks, drawing me nearer, for I had made a feint to draw back, and without more delay plied me with such fast and furious blows that I was near fainting away. With a violent effort he forced his spear right in, and the point fixed itself in the depths of the wound. I cry out.... Caviceo spirted out his venerean exudation, and I felt irrigated by a burning rain.... Just as Caviceo slackened, I experienced a sort of voluptuous itch as though I were making water; involuntarily I draw my buttocks back a little, and in an instant I felt with supreme pleasure something flowing from me which tickled me deliciously. My eyes failed me, my breath came thick, my face was on fire, and I felt my whole body melting. “Ah! ah! ah! my Caviceo, I shall faint away”, I cried; “hold my soul—it is escaping from my body” (Dialogue V.).
Finally the conjunction with the woman lying on her side, particularly on her right side, is deemed by Ovid the most simple, calling for the least effort:
“A thousand modes of Love are there; the simplest and least laborious of all is when the woman lies reclined on her right side” (Art of Love, III., 787, 88).
Above all this position is the most convenient for tall women:
“Let her press the bed with her knees, with the neck slightly bowed, she whose chief beauty is her long shapely flank” (Art of Love, III., v. 779, 80).
It seems that the Phyllis of Martial allowed herself to be done in that way:
“Two arrived in the morning, who wanted to lie with Phyllis, and each was fain to be first to hold her naked body in his arms; Phyllis promised to satisfy them both together, and she did it; one lifted her leg, the other her tunic” (X., 81).