Ours are:
- We play together
- We don't go for anything painful
- Condoms for intercourse, unless we know and trust you really, really well

- Bathroom stuff belongs there and not in the bedroom
- No emotional entanglements
- No cheaters (yes, you
will need a note from your wife.

)
That's about it.
This question comes up a lot. Here are some other threads:
Is there anything off limits with others that you only do with your partner? Setting Limits for sexual encounter. What is off limits to you?
-B