Meaning of “one flesh”

What does it mean to be “one flesh”?

-- Here's a few questions to get into specifics:

Does 'one flesh' happen when you get married?

Does it happen with sex? Does first base count? Second? Third? 

Something else?

Is it a continuing process that builds slowly or is it more of an on-off status that happens at a moment in time?

Is it undoable?

Is it possible to be one flesh with many partners?
 

-- What are some interesting reads? I'm looking for both reliable and otherwise. 

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Dan Miller's picture

That's helpful.