Is the toothpaste tube a measure of marital harmony?

From 'The Avengers' - "Two's a Crowd" episode

In response to an assassination threat, Steed is being guarded night and day by an officer from special branch, who sits impassively on the settee and refuses to take off his overcoat. Steed emerges from the bathroom and says breezily "have you always squeezed the toothpaste from the middle of the tube?" to which the dead-pan reply is "Only since I got married..."
 

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