I just watched a groovy period piece from 1973, "Bob & Carol & Ted & Alice."
It has Elliot Gould (Monica & Ross's dad on Friends), Robert Culp (Deb's dad on Everybody Loves Raymond), Dyan Cannon and Natalie Wood.
It is very funny. Sometimes intentionally. Other times not.
Here's a review.
http://movies2.nytimes.com/gst/movie...html?v_id=6379
What the world needs now is love, sweet love. But that doesn't mean you should shtupp everyone you love.