When I started reading the thread, I thought we didn't have many, but I guess we do:
1) Condoms for penatration.
2) Everybody has to be cool with the arrangement. If one of us is not having a good time, that's it.
3) If we play at our house, no playing in our bed...but this one we've talked about changing for certain couples.
4) No anal for me. Drew can if the person he's with is into it.
Other than that, it's all good. Or, at least we haven't been faced with a situation that's made us get more rules.
Pepper