Nicole Kidman and Keith Urban are both masters of their craft — her at acting and him at singing. And having been married for 19 years, the two have figured out how to make things work. In an interview with W Magazine published on Friday, January 3, Kidman, 57, shared the secret that has allowed her marriage to Urban, also 57, thrive.

Nicole Kidman and Keith Urban credit their 18-year marriage to separate toilets, a double-headed shower, and unconventional romance.

The Golden Globe winner married the country singer in June 2006. The couple are the parents of daughters Sunday, 16, and Faith, 13.