Slavery: A series of erotic games (book 01)
It was a guilty pleasure, not an expectation.
"Well, think about it," I said. "To think a single man can satisfy multiple women is unrealistic. Men have to reload, so's to speak, after having sex. He'd be lucky to satisfy two women realistically. A woman could easily satisfy many men if she was willing. There's no reloading required. One finishes, another one takes his place."
"Ahh, biology, the differences between men and women. Still, ten is awfully high. A woman can only satisfy three men at once, unless she uses her hands as well, then maybe five."