The Seven Year Itch (1955)

With his family away for their annual summer holiday, New Yorker Richard Sherman decides he has the opportunity to live a bachelor's life--to eat and drink what he wants and basically enjoy life without his wife and son. The beautiful but ditzy blonde from the apartment above his catches his eye and they start spending time together. It's all innocent, but there's little doubt that Sherman is attracted to her. However any lust he feels is played out in his own imagination.