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The same might be said of the corridors of the ship, or other non private areas; no sucking face where the crew could be a witness (in general) I would think holding hands might be okay, strolling through the gardens / arboretum, if the ship has one, especially if you are in a next gen or later series, and they are married. TOS era, this would be less common, as would married crew members, overall.
My take on it is that marriage have become just another tradition ceremony that some people like, but that it have lost any significance in laws and regulations. But i tend to agree that anyone trying to make out in a public area would hear a "get a holodeck."