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Ashton Kutcher and Mila Kunis recently revealed their dirty little secret -- they don't bathe themselves or their children for days on end.

Jake Gyllenhaal also revealed he doesn't believe bathing every day is "necessary".

The 40-year-old actor believes water dries his skin and he has to moisturize more often.

He says not bathing for days is "helpful for skin maintenance" to allow the body to "naturally clean" itself before taking a bath.

"More and more I find bathing to be less necessary, at times," he told Vanity Fair magazine.

Alberto E. Rodriguez/Getty Images

The Relic star made the comments after a debate about cleanliness was sparked by Hollywood power couple Mila Kunis and Ashton Kutcher, who recently admitted they don't bathe their children until they "see dirt" on them.

Kunis and Kutcher revealed their hygiene practices during an appearance on the Armchair Expert podcast.

Mila, 37, revealed that she hardly ever had a shower growing up as a child because they didn't have hot water at home.

"I didn't have hot water growing up as a child, so I didn't shower much anyway. But when I had children, I also didn't wash them every day. I wasn't that parent that bathed my newborns — ever."

Ashton, 43, added:

"Now, here's the thing: If you can see the dirt on them, clean them. Otherwise, there's no point."

Body odor usually doesn't occur in children because their underarm sweat glands don't develop until puberty.

Sweat is usually odorless in adults. Body odor is caused by bacteria feasting on dead skin and the compounds in sweat.

Soap and water temporarily decreases bacterial colonies in the underarms.

Question: How often do you shower or bathe?

A. Once a day
B. Twice a day
C. Once a week
D. Twice a week
E. When I smell myself

Mila Kunis and Ashton Kutcher Expecting

Actors Mila Kunis, 30, and Ashton Kutcher, 36, are expecting their first baby together. This is the first child for either of them. The couple began dating in 2012 and announced their engagement in early 2014. Kunis previously dated former child actor Macaulay Culkin in 2002. At the time, Kunis said marriage was not in the cards for her. Her exact words were marriage is "not something that's important to me."

Kutcher and his ex-wife, actress Demi Moore, 51, split in 2011 amid rumors of infidelity. Their divorce was finalized in late 2013. The union was childless. Kutcher and Kunis met on the set of TVs That '70s Show.

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