updated 05/13/2010 AT 10:00 AM ET
•originally published 05/13/2010 AT 1:05 PM ET
Antonio Banderas and Melanie Griffith are a rarity in Hollywood – a couple married for 15 years and still going strong despite divorce rumors and stints in rehab. So, what’s their secret?
“There is one virtue that is very underrated and that’s passion,” Banderas told PEOPLE at the New York launch of his fragrance, The Secret. “If you lose your passion, all these other virtues that are way more important, they just all fall.”
The actor, 49, who also displayed his first photography exhibition “Secrets on Black” with pieces auctioned via Charity Buzz to raise money for Broadway Cares/Equity Fights AIDS, says that hard times can make a union stronger.