Most couples will agree that communication is the foundation of any successful marriage. But ask husbands and wives what they’re NOT talking about and guess what? It’s not sex, or kids.

It’s money.

Twenty percent of people are lying to their significant others about their finances, according to a recent survey from Forty-one percent spent more than $100 without telling their partner.

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But we’re not talking a random download here and there, a new golf club or a pair of shoes. We’re talking big money. Twenty percent of respondents reported spending over $500 on a single purchase without telling their partner. Men are more likely to hide their spending than women, and no surprise, the secret purchases break down along gender lines: Men buy electronics (read: toys), while women buy clothes.

This is a problem: Financial infidelity can be just as damaging to a couple’s foundation as sexual infidelity. Couples need to start taking the “for richer, or for poorer” vow more seriously, open their books to each other and talk money.

But you need not lay out every withdrawal slip or every credit purchase you’ve ever made. Couples simply need to be honest about their finances together, says Amanda Clayman, a New York City-based financial therapist (and yes, there is such a thing).

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“Honesty,” Clayman says, “doesn’t necessarily mean full disclosure, at first. But any time you are lying or misleading, even in the beginning, that behavior can have a destructive long-term effect on the partnership.”

What does honesty in a financial relationship look like? Clayman says healthy financial relationships are:

  • Equal: Both partners have the same decision-making power.
  • Inclusive: Both participate in the exchange.
  • Transparent: Both have a right to access all information.
  • Flexible: Both understand that financial agreements can be changed as needed.
  • Sustainable: Neither partner is forced to “endure” the arrangement such that it can’t continue.

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What if married partners have very different views on money, how to make it, where to put it and what to buy with it? Clayman says this all-important set of “financial values” can be all over the map, from the compulsive “pay-in-cash” debt avoider to the “it’s only money” carefree spender.

It’s why money conversations are so important. Find out where your minds meet and go from there. Work out a plan that will allow you to splurge from time to time and not go too far into debt, advises Clayman. Two heads are better than one, after all.

If you’re strapped for cash (and who isn’t?) and living paycheck to paycheck, it’s even more important to stay on the same page financially. If you’re honest, you have a bit more room to be human and make sure that new Apple Watch won’t leave your partner in the lurch at the grocery store.

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A joint checking account also helps, says Clayman, because it “requires coordination to ensure goals are being met and spending is kept in check.”

Healthy financial relationships also have some key elements:

  • Communication: Take turns speaking and listening, then reflect what you hear.
  • Clarity about goals: “Saving more” is not helpful; “saving X dollars” is.
  • Negotiation: Try to get a win-win where both people’s key values can be incorporated.
  • Compromise: Realize you won’t get everything you want, but prioritize the good of the whole.

But what if money (or lack thereof) is causing stress, and talking about it makes things feel worse? Clayman says this is common. A clear-eyed look is the way to go.

“Get clear on those elements of your financial life that are in your control,” she advises, “and those that aren’t.” Once you separate the two, Clayman advises clients to “release those things you can’t control, process the sadness you may feel about the losses and stress, find ways to feel in partnership with your spouse (working on the same goals), and focus on those things that bring you joy in your life today.”

Clayman even advocates distraction as a way to stop worrying.

“Make peace with where you are, or make peace with your plan to fix it,” she says. “After that, take care of yourself, and take care of each other.”