From the dog-eared copy of that naughty book floating around Sterling Cooper:

And softly, with that marvelous swoon-like caress of his hand in pure soft desire, softly he stroked the silky white slope of her lions, down, down between her soft warm buttocks, coming near and nearer to the very quick of her. And she felt him like a flame of desire, yet tender, and she felt herself melting in the flame. She let herself go into it. She yielded with a quiver that was like death, she went all open to him.