The term 'virgin' refers to the chosen women who were given the 'privilege' to reproduce (sexually or artificially) with extraterrestrial giants who could not leave the earth, known as the Brotherhood of the Serpent. Their first 'model' of genetically altered humans was known as the Sons of the Serpent.
The story of Jesus is based on similar, older stories from older religions, which themselves might even be passed down from even older religions. But the tale is a metaphor.
The 'virgin' birth of Jesus was the creation of the Sons of the Serpents by the selfish giant beings from space, who were claiming to be Gods, starting to create their foundation of control over us, to achieve their eventual goal of escape.
The message 'Jesus' tried to get across in the bible story, is the same intentions of the Sons of the Serpents. And over the thousands of years of interbreeding, confusion, destruction, infiltration and misinformation this story is what remains.
