The "kissing cousin" trope is a staple in storytelling, often used for comedic or dramatic effect.

: In the 19th-century U.S., a shift began as medical and religious authorities began associating cousin marriage with "idiocy" and genetic defects. This led to many states enacting bans that remain today; 30 states currently prohibit first-cousin marriage.

: In the Southern United States, the phrase emphasizes strong family ties where even distant relations are treated as close kin. Cultural and Legal History

: It is often used to describe two separate things that share a close similarity or common origin, such as "politics and show business" or different types of fabrics.

: Outside the Western world, cousin marriage remains a preferred practice in many societies in the Middle East, South Asia, and North Africa. Genetic Considerations: Myth vs. Reality

: Elvis Presley famously starred in the 1964 musical film Kissin' Cousins , where the title track lightheartedly suggests that a "distant cousin" is fair game for romance.

: Children of unrelated parents have a 3% risk of congenital defects.

: Throughout much of human history, marrying cousins was common to preserve wealth, maintain social status, or secure political alliances. An estimated 80% of all historical marriages were between first or second cousins.