Washington:�Salma Hayek, who married billionaire Francois-Henri Pinault in 2009, has doled out a major piece of advice for a happy marriage. In a recent interview with a leading magazine, the 49-year-old actress said, "Sex is not the key to a happy marriage, but it's a side effect," reports E! Online. The 'Frida' star even mentioned that regular sex "loses its charm," rather a couple should "continue to laugh, continue to explore, continue to have fun with each other, and continue to have romance." Although Hayek is an Oscar-nominated actress, she says she is most proud of her personal life. "A good marriage, full of love, is my biggest accomplishment. Home is where my husband is," she added.