Chesterfield Rugby Meaning

(Canada, idiomatic, euphemistic) Sexual activity.

Example: 1973 Aug 25, Doris Clark, "Successful Living," The Leader-Post:
  As to necking and petting, as a kind of part time recreation, frankly, it's a failure. You'll do better to dance together or play tennis than to use up all that ebulience in what we used to call chesterfield rugby.
1975 Nov 13, "Lazy Muscles: Fitness Scares Them," The Montreal Gazette:
  "There are so many adults with fitness problems today because, other than a little chesterfield rugby, they never exercise," said Allan Little, Edmonton YMCA supervisor.