As I've mentioned in earlier posts, I've ridden tandems only a couple of times in my life. I can't, therefore, claim to understand the relationships between members of a tandem-riding "couple," some of whom are indeed married or otherwise enjoined.
Somehow I imagine that in at least some tandem-riding couples, one member serves as the navigator. In some ensembles, the "captain"--the rider in front--is directing the ride and the person in back is mainly supplying muscle power, while other pairings include a "stoker"--the person in the rear--who navigates.
I got to thinking about those relationships when I came across this:
