An exposure can be can mean a lot of things to different people, but the bottom line is that it is basically talking about freedom. Being left unprotected for whatever reason can leave a person exposed to dangerous things and people.
Freedom can also lead to harm for some persons because they are too young to be left alone and exposed. The exposure brings us out in the open, to some it is a good thing, to others it is not a good thing. Whichever way, it is good to make a good choice. The idea is to be exposed to good things.
And we have the exposure in photography, I think it is the same concept expect this is a non-living thing.
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