'Sister Wives' Spoof Tons of Family Fun

One man, four wives. It's the stuff porn was meant to spoof.

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TMZ has learned the gang from "Sister Wives" has been honored with a XXX homage. 

Despite the fact that Kody Brown claims he and his wives don't have sex as a group, we're guessing Vivid Entertainment is going to take some creative license.

A family that plays together...