Oo males out hunting in the jungle to provide for their village might have decided to "butt fuck" each other, might have even done so regularly, and might have even developed affection and caring for each other.

But such a relationship, even if characterized by strong emotional and instinctive bonding, would not be a "marriage", for the simple reason that such behavior was not the behavior that was the subject of the "marriage" and gender roles part of the village's "way of life". Such behavior would not have been likely to have been consistent with the "way of life" of any village, and so would not have been codified in its "way of life" at all.