Polygamy has always been about male dominance. Usually springing from an unequal society and used to keep it that way. In the U.S., polygamists marry very young girls and brainwash them and all their female offspring into believing their sole role to be serving the male.
It's too bad you think sex is about power, Bishop. No good can come of that, surely.
Polygamy, in the U.S. is about pedophilia. Well, that's the conclusion I came to after reading this: Under the Banner of Heaven.
The book wasn't nearly as much fun to read as his mountaineering books, but still interesting.
No! The mutual desire is the motive. The original desire is to satisfy the individual independence from how satisfied will be at the end the other side.
This is why sex is a strong factor between relationships, because chemistry allows both to be pleasant with it or not.