As a Woman, my 'take' may be a bit different as to why I like 'face down' scenes also (I emphasize the 'also', because, well, variety is always the spice of Life, of course. If anyone's found THE 'one position' that satisfies all their sexual arousals/desires, they haven't tried many positions!.....

).
I 'feel' the Woman, inside, rather than react only to her emotings through her body and the 'views' (like Ash, I'm seeing part of my own sexuality/sensuality in the reactions of another woman), so for me, the famed 'Crawl' can be a HUGE turn-on part of a struggle scene, a scene where the woman has taken a bullet or two, or a blade, and inTENSEly her 'sex' rubs against whatever surface upon which she has fallen or draped over. She will not be an innocent victim, and will be an intense woman who FIGHTS with every breath to reach her gun, or make it to that next room to take the other bitch with her in defeat.
And I find it intensely sexual either way, whether she lasts long enough to blow away the bitch who shot her, or whether the other bitch sees her at the last moment and finishes her off, or whether her own gasping breaths just 'run out' before she can accomplish her final goal, as with 'poor Claudia' in the recent AD scene.
It's not the 'same' as our fantasy Videos, but one of the first I EVER saw was the B & W "Operation Roses' machine gun and crawl scene where the last 'goodie' was a woman who finished off the last of the 'bad' Germans in the WWII flick......just before the last German on the cold floor of the warehouse machine-gunned her from below just as he died....and her crawl on her belly, in agony, with one one hand stretched OUT to attempt to reach that of her dead lover, was awesome to me....then AND now....for 'mood'. She dies JUST before her hand is able to reach his and hold it 'forever'.
Very sensual and emotional scene for me, and I think 'our' Producers can play on that theme well also with at least 'some' face-down moments and freeze frames, no matter the 'final' view. There, she was of course fully clothed and with leather jacket, even, but our Producers can emphasize any body parts (say, her arse?....lol) with any attire they choose, because this is fantasy!
I don't think most men object to some views from either side of the Prize.....
Sand is good, for face-down scenes,btw....LOL......but COLD marble floors, or deep pile carpets, or a bed or a different rug or rocks or grass or any other 'thing' that provides something to grind against during the.....'surrender'. The back/arm of a couch makes a classic object upon which to pull oneself up in the struggle, gun at the ready, only to be be finished off over that couch with requisite draping and/or grinding, and, certainly, sliding....lol.
I like slow surrenders; I don't care where 'she' ends up for a Final View, as I can always freeze certain frames during her 'crawl'.
But I'm also with Gold that I HAVE to see the Face during the process, rarely is 'only' rear view good enough for me. The face, and of course the EYES, are so much of the appeal for me as I attempt to 'feel' the particular 'fantasy mood and feelings' that the Producer/Director/Actress are trying to convey AND that is a part of my own sexual/sensual erotic turn-ons from such scenes.
And I'm a HUGE fan (from the playing of scenes like this....lol) of the beautiful 'Body Rollover' from face down to face up, where the arms and all parts just sort of limply 'fall' into their final positions while the body is being rolled over. This also allows, as Anne's Dreams has now done at least twice, for the face-down woman who has been shot to deliver the coup de grace in return as her gun from beneath her roars during the rollover, and is normally very close to her Killer's body when it does roar. Hard for even a Blonde to miss from that range, no matter how close to 'final surrender' she is.
Women like ass views of men, too, so we're really not shocked that face-down is appealing to some Men also for a female victim......lol. And we do know that our backsides are among the areas 'most frequently viewed'....lol. And to lie there face-down and KNOW your ass is being admired as part of the post-play, is never a bad thing for a Woman.
And to be rolled OVER and KNOW that you ARE the object of ALL eyes as you 'unwind' into that final position, is exquisite at least for me.
It is simply a classic 'offering herself' and/or proclaiming herself, and all of her, to be...'available', as in symbolically 'here I am, take me'..A Woman does like to be 'admired' and watched for her body, it is said.

And 'playing dead' is a spectacular time, because the Woman (i.e. ME...lol) has to do NOTHING further to BE admired and KNOWS the Man/Men are gazing at her with various sexual thoughts.
This is a complex subject, Max, so I hope we have pricked your.....imagination. Or was that 'imagined your.......'.......ah, never mind.
Sandi