Philip From how many girl gangbang counts as such? 5?
I don't think there is a rule of thumb for a "reverse gangbang", except for that it's definitely 1 guy with at least 4 women. But there have been several BGGGGs in VR already. In my opinion, to really make a statement, I would say anywhere between 6-8 would count as a full blown reverse gangbang. But the most important thing is to keep the focus and action centered around the male POV. It doesn't really count if there are women in the background not paying attention to the viewer. The "harem" feeling is feeling like a king. A greedy, selfish, horny king. =)
PS, I really like that you are continuing this conversation with us. Thank you for that =). Do you think the chances are high that this will actually happen? I know logistically this is a difficult and expensive ask.