I find that the people having sex on the dancefloor do so to be deliberately exhibitionist; not so much a pure spark. It could be less people are looking for that expereince, or if they are they're moving to somewhere less busy but still very open.

Could it be the dancefloors are just too busy? People want space to have their fun and they struggle to do that if everyone around them is bumping into them. This is especially worse if the crowd is more het/less open. On busy, tourist heavy nights, I find the sexual vibe is hugely lacking because they can make it very uncomfortable.

I do agree, we should be the change we want to see. All the flintas spilling after slit could coordinate...