public rape/tribal ritual
I guess this could be placed either in modern times or in the past, but either way it would certainly have to be beyond the common reach of civilization
I can imagine that a tribe, having won a battle to avenge some ill, hold a late evening celebration. In the course of this, one of the women captured from the raid is brought forth into the public square or the central bonfire area, and while the crowd watches and cheers, is sexually taken by the strongest of the village warriors. She could be stripped down and tied to a low altar, or she could be left free, and the physical wrestling that ensues would be part of the entertainment of the event, the warrior the inevitable victor in this tussle.
After this public humiliation, the woman would be the property of this warrior and taken to his home. Perhaps he already has a mate, perhaps not, but the story would presumably move on from there. Perhaps the two evolve a more intimate relationship, or perhaps this captive woman works an appropriate revenge.
I get the feeling this idea is just a little bit less bizzarre than most of my other ones, and for all I know, has probably already been done in some form in the non-consent catagory. If it has, then I don't have a vivid memory of it. I did myself write a very short story in a Yahoo club involving a tribal warrior knocking out a woman with a blowgun and having his way with her that way; think I'll have to try and find it and see if it can't be adapted to a proper story either.
"We wander 'round but cannot move 'cause we're imbedded in concrete"