And if you interpret Genesis 4:1 of the KJV literally, it confirms the rumors.
Oh ok, I see what you mean, one can use the NT version as an overlay of the birth of Jesus Christ was on this wise.
"And Adam knew his wife; and she conceived,
When as his mother Mary was espoused to Joseph,
and bare Cain,
they came together, .
and said, I have gotten a man from the LORD"
she was found with child of the Holy Ghost