I don`t know that there is any proof of it, other then old stories, but I have heard that some of the early colonial men misunderstood why certain native american men, had multiple wives.
Thinking this was a grand idea though, they created this religion to justify the perversion, and in fact many native women were taken to the west as the first wives, of the mormons.
According to old stories, it might have been that particular native men did have several "spirit" wives, these were wise women, teachers, who would spend much time and in some cases actually live with a man, and his real "wife" if he had one.
This was to teach him certain things in preparation for a particular task, or appointment, if he needed such training, or special instruction to accomplish it.
But spirit wives were never real wives, and no sexual perversion was ever involved in it.
Other times captive women may have been taken in, but these were generally slaves used to do menial labor, and not as wives in most cases, and were kept only until they were ransomed, or stolen back by their husbands, brothers or fathers.
It would have been a great dishonor for native men to abuse any woman sexually, and was rarely or never done. This was a thing not understood by European men, and even the Jesuits commented on, many times!