I like the idea but I'm not sure any of the player couples fit the bill. Perhaps an NPC invitation or a "golden ticket" type of thing that brings us all together?I'm not really available on weekends either usually. I'm hoping that an experienced couple would invite us to either a private party to include all of us, or one of the exclusive clothing optional clubs. We can refer to the crowd in general as being naked so there is some degree of peer pressure to get naked.
Another idea might be an 'erotic bonus experience' menu item that each of them picks so they end up on an adult only boat tour that is clothing optional, with some taking to the idea much quicker than others but eventually the last hold outs are pressured into it.
I'm sure there are other ideas along similar lines. I'm a little skeptical of a scene with this many writers all at once but we do have some pretty experienced writers here so I am game. Kind of the OP's call though, I can work through the group couple by couple as well.