I don't know that it would be possible to "make a law." Legislating morality does not generally work. There are two issue that come to mind with your question:
First, a society generally holds a collective moral standard. e.g., 50, 25, probably even 10 years ago in western society culture, this kind of corruption would not have shown its face. Did it happen? Maybe, though I doubt to that degree. But it was not something that a woman or her betrothed would have flaunted like this.
That leads to the second issue. This, I would say, is a bellwether to where things are headed. With this kind of debauched behavior becoming acceptable, it will eventually be considered within the bounds of normal behavior, and a society built on this kind of debauchery cannot long sustain itself. History proves this.
The solution lies not in legislation, but it a moral and spiritual renewal wherein society once again puts value on things like modesty, decency, family, protecting women and children from predatory behavior - their own self-predatory behavior as well as that of others. This cuckhold of a "finacée" (the word loosely used) has failed in his duty as a husband even before betrothing the woman. He has let her be used as sex toy and a whore by a host of men.
I recently had to essentially rescue a woman very close to me from an attempt at being sex trafficked. She was blind to what was being done to her. I stepped in and intervened. Had I not, she would, by now, be locked in some filthy room somewhere, drugged up and being abused multiple times a day by numerous men. This is what men do for the women around them. They do NOT stand by and egg them on as they are used and abused by other men. Men (actual, real men, not just some dufus who happens to have XY chromosomes) take the lead and care for and protect. This jerk did not.
If this is where we are headed as a society (and I believe that this is truly a bellwether), then we are done.
Gang bangs for viewing and entertainment are not new and long predate the internet, video, film and printing press. Consent and exploitation have always existed and have always existed on an uncomfortable continuum. The only difference between modern and ancient debauchery is the ease of access.
