While my wife doesn't carry, yet, two couples that are friends of ours are his-and-hers carriers.
One couple owns a 44' ketch, and travel the caribbean sometimes. Those two even practice pirate/hijacker drills, and have code words for "shoot the person(s) who are with me" when they travel.
So briandg's assumption is... well... an assumption. I have to agree with Pax. (And I'm trying to get my wife to carry.)