Many years ago, I shot my CPA's wedding. When it came time to shoot the reception, he briefed me on his "method of removing the garter". He told me where to be for the correct camera angle. Use your imagination, but he and I decided to make two versions of the video.
I think a good guide line is if you think it could offend someone, don't do it.
Along the same lines, I've shot tons of "B" roll of crowds at airshows. I had one shot that made a perfect cutaway to people looking up, pointing, and showing amazement. After a couple hundred copies shipped, a friend of mine called and said he really enjoyed the crowd shots I put in. The lesson I learned from this is get a bigger monitor and look very closely at the women in the grandstands. I decided to change the master.
Editing the audio from a wedding reception really boils down to common sense. Wedding videos have been known to ship to the minister, etc. On the other hand, it's the bride and grooms moment in time- maybe they should make the decision since they paid for it. Remember- you can extract the sound clip and email it to the client for their input. I've do this for marketing videos when there are choices of music or changes in voice overs.