my main concern is that this requires lots of trust on all parts. Personally I am not into it and I am probably too monogamous to even try it.
As long as everybody actually wants it and nobody will get annoyed at somebody else that participates then I think it is all good. If one is opposed and dont want to then the idea isnt going to work in the long run.
and lol annie. yes you need somebody that is in "charge" and not two