In this article New Testament passages referring to the birth of Jesus are related to Celsus’ anti-Christian arguments and the Jewish Toledot Yeshu tradition with a new question: Why it was so difficult to speak about the virgin birth of Jesus? It is argued that the concept of the virgin birth of Jesus was seen to be problematic for two reasons: 1) The concept was liable to result in scurrilous rumours, even scoffing and parodic episodes revolving on its sexual aspects. 2) Every attempt to explain that God was in some way the agent when a young girl conceived came too close to Gen. 6:1–4 – the text which explained in ancient Judaism the origin of the demonic world. Therefore, some New Testament authors (for example, the writer of the Gospel...