Main Street by Sinclair Lewis

Of the lovemaking of Carol and Will Kennicott there is nothing to be told which may not be heard on every summer evening, on every shadowy block.

They were biology and mystery; their speech was slang phrases and flares of poetry; their silences were contentment, or shaky crises when his arm took her shoulder. All the beauty of youth, first discovered when it is passing -- and all the commonplaceness of a well-to-do unmarried man encountering a pretty girl at the time when she is slightly weary of her employment and sees no glory ahead nor any man she is glad to serve.