I understand that an erotic novel is sometimes just that & that's fine.  I'm willing to suspend disbelief with the best but this was just beyond the pale.  I would've thought it was a joke save for the sex scenes which though graphic were anything but sexy or even accidentally humorous. The characters seemed to be placed in the plot merely to execute a series of not very imaginative sex positions with no relation at all to their station in life or the time period they are meant to be living in let alone any kind of inner life or even surface life. Skip it!