WASHINGTON

Your parents spill a few secrets as they get older.

One night at dinner with my mom, I ventured that the rhythm method had worked well for her, given that there were six years between my sister Peggy and my brother Kevin, and six more between Kevin and me. She arched an eyebrow. “Well, sometimes your father used something,” she said.

My parents were the most devout Catholics I’ve ever known. But my dad came from a family of 16 in County Clare in Ireland, and my mom’s mother came from a family of 13 in County Mayo. So they balanced their faith with a dose of practicality.

After their first three kids, they sagely decided family planning was not soul-staining. So I wasn’t surprised to see the Gallup poll Tuesday showing that 82 percent of U.S. Catholics say birth control is morally acceptable. (Eighty-nine percent of all Americans and 90 percent of non-Catholics agreed.) Gallup tested the morality of 18 issues, and birth control came out on top as the most acceptable, beating divorce, which garnered 67 percent approval, and “buying and wearing clothing made of animal fur,” which got a 60 percent thumbs-up (more from Republicans, naturally, than Democrats).

Polygamy, cloning humans and having an affair took the most morally offensive spots on the list. “Gay or lesbian relations” tied “having a baby outside of marriage,” with 54 percent approving. That’s in the middle of the list, above a 38 percent score for abortion and below a 59 percent score for “sex between an unmarried man and woman.”