Galatians 4:4
But when the fullness of the time came, God sent forth His Son, born of a woman, born under the Law,

In Galatians Paul is doing his best to give Jesus "a buildup."
Had Paul known that Jesus was born of a virgin, Paul would have certainly used that to give Jesus a proper "build up."
But he just wrote.., born of a woman, signifying Jesus was born like any other human.

Paul doesn't seem to know anything about a virgin birth of Jesus.
Read what Paul says at Romans 1:1-3
Paul, a servant of Jesus Christ, called to be an apostle, separated unto the gospel of God,

2 (Which he had promised afore by his prophets in the holy scriptures,)

3 Concerning his Son Jesus Christ our Lord, which was made of the seed of David according to the flesh;

The word "seed" in verse three is "sperma" in Greek. I think you can figure out what Paul is saying.
Paul is saying Jesus had a father who was a male descendant of King David and who impregnated Mary with his "sperma."