I don't know the book, but it appears to be about Frost, so, uh, I would guess he was quoting the famous Frost poem.
But I know, you're not really asking, you're making fun of my wild, crazy, wacky idea, ha ha. Robert Frost is a revered, canonized poet! He couldn't possibly have been kinky, or have indulged in a little playful innuendo. Heaven forfend.
I'm not saying he was, or that the whole poem is about that (that obviously doesn't work), but I don't see what's so inconceivable about it, either.
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