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Josh Groban – You're the Only Place Lyrics 18 years ago
I'm pretty sure that this song is not about Sex ... Must be an old D. Foster Song - and he's popular for his LOVE-Songs ...

Anyway, the guy sings about the love of his life which he lost. That's why he's calling out to her and begs her to come back.
With ".. what we've done" he means just breaking up.
The only thing I wasn't certain about is if he's calling (in the first line of the chorus) to God but it's free for interpretation.

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