Michael J. Fox and Tracy Pollan spoke about their long and happy marriage during an appearance on Thursday’s “Tonight Show”.

Fox, 57, married Pollan, 58, in 1988 and host Jimmy Fallon was keen to know if they had any secrets to staying together for so long on the show.

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The pair have four children together; Sam, Esme, Schulyer and Aquinnah.

Fox, who suffers from Parkinson’s Disease, said when asked about his marriage, “I keep the sex dirty and the fights clean.”

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The “Back to the Future” actor’s appearance also saw him talk about how he met Pollan on “Family Ties”, as well as how he’s raised $800 million for Parkinson’s research and treatment.

Pollan then discussed her family “flexitarian” cookbook, Mostly Plants.

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