Time spent with good friends is more valuable than any precious commodity. The simple fact that gold lasts forever somehow diminishes its value in comparison with friendship. Friends and time with them is fleeting, so it's to be savored even more. In the Simon & Garfunkel song Old Friends two old men are referred to as bookends because of all the stories between them.
When we share time with other caffected couples, the enrichment is magnified. How many stories are there between you and your caffected other?