There was a husband and wife who shared an enthusiasm for a particular aberration.

For his birthday, she bought him a wall-mounted clock. It was in the style of traditional European clock-making.

It had one unusual feature: each hour, on the hour, a small male and a small female mannequin would exit through a door near the top of the clock and, each time, they would engage in a seemingly random act of simulated intercourse. The simulation was crude, but effective.

When the hour would strike, and the husband would watch the resulting spectacle, he was overwhelmed by excitement, knowing his wife was engaging in the same activity with a random stranger.

Those who dared to ask him about this peculiar timekeeping device would invariably receive the same reply: “Why, it’s a cuckold clock.”