Storing a significant other’s fingerprint on an iPhone’s Touch ID fingerprint sensor may sound like a new way for couples to show trust in one another. But U.K. banks are frowning on the process, especially if customers use that same device with the Apple Pay mobile payment service.

Several U.K. banks have warned customers that storing their partner’s fingerprints on their iPhone could be treated as if they failed to protect their banking information, which could potentially leave some consumers on the hook for fraudulent transactions, according to the Telegraph. That’s in part because fingerprints stored on the iPhone can be used to authorize Apple Pay transactions in addition to unlocking an iPhone.

HSBC’s terms and conditions warn customers not to register another person’s fingerprints on the smartphone, and Lloyds Bank explicitly calls out Apple’s Touch ID sensor in its terms of use: “If Touch ID is available on your device, you must ensure you only register your own fingerprints (and not anyone else’s).”

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