I was LDS for a number of years and am still married to an active LDS member...I've never heard or seen anything of which you relate.
Maybe within the polygamist sect that is not recognized by SLC or unofficially by members taking things into their own hands, but I don't know of anything that is sanctioned by the church.
Not meant to sound like or come across as a rebuke, just trying to clarify things a bit based on my experiences.