St. Paul is generally very direct in his preaching and never more than in his words to the people of Corinth. If I were in his audience today I can’t imagine sleeping through what must have been a shocking question (likely delivered with vehemence) that would make anyone sit up straight and take notice. Think about it.
Do you not know that you are the temple of God, and that the Spirit of God dwells in you? (1COR 3:16)