About time someone here got it right.
This particular 'revelation' lends particular credence to the once contemporary understanding that Mormonism was initially a sex cult.
EDIT: I'll modify this a little. It would be more correct to say that Joseph Smith was clearly, by not only modern but contemporary standards, a sexual predator who manipulated men and women through contrived 'doctrine' for his own sexual desires. We know that Joseph Smith married his friends wives, his friends daughters, his wives maids and impressionable young girls one of whom he would later marry; Mary Rawlins. Some famously said no, despite experiencing what we would now under stand to be sexual harassment; Nancy Rigdon or Sarah Pratt who he publicly slandered. Joseph often explained that an angel of the Lord had revealed the doctrine of plural marriage to him three times since 1834. He would always say how repugnant he was at first and then said that the final time the angel brandished a sword and said he had to obey this or would be slaughtered. Sure Joseph.