To inform them all (probably leave Dh out of the round robin) that I do not want to have sex with them unless and until further formal notice from me?
As it seems that there is such confusion among so many people about the nature of consent I want to avoid putting any of them in the terribly awkward position of wondering whether simply being in the same room as them means they are invited to stick their dick in me.
So is that an unreasonable proposition?