We have a few rules, which we spell out in our online profile - the most prominent of which is that we are not currently in full swap mode.
Our full swap limitation is probably not unusual for couples in our situation - long term momogamous relationship punctuated by a relatively meager amount of swinging experience. We may be singing a different tune down the road a bit...
In fact, we currently have two exceptions to our full swap rule. 1) Any couple which visits us from more than 1,000 miles away, and 2) Any couple who can guess our favorite baseball team...