This doesn’t just apply to romantic partners, either.
A quick peck on the cheek may expose you gluten.
Is Gluten From Kissing Really Enough to Make You Sick?

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Whether or not you’ll be affected by secondhand gluten depends on how sensitive you are to gluten.
For many people, microscopic amounts are enough to cause a reaction, unfortunately.
In addition to the steps above, time also helps.
Cohen IS, Day AS, Shaoul R.Gluten in Celiac Disease-More or Less?Rambam Maimonides Med J.
2019;10(1):e0007.
2019;68(1):26-29. doi:10.1097/MPG.0000000000002129