A relationship expert says flirting boosts self-esteem and confidence, but couples in long-term relationships often lose the "muscle memory" of playfulness.
https://www.foxnews.com/health/why-couples-should-flirt-each-other-every-day-plus-red-flag-avoid
https://www.foxnews.com/health/why-couples-should-flirt-each-other-every-day-plus-red-flag-avoid