Robert Goff wrote:

I seem to remember a short scene in Altman's Three Women with someone 
(Shelley 
Duvall?) being shocked to discover Sissy Spacek's aged parents making 
love.

You remember the scene correctly. Spacek's parents were played by film 
director John Cromwell and his real life wife, actress Ruth Nelson. On the 
commentary on the Criterion DVD, Altman said he included the scene because 
he thought no one had ever thought much about the sex lives of older 
people.

SJU

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