And Adam knew Eve his wife; and she conceived, and bore Cain, and said, I have gotten a man from the LORD.
All Commentaries on Genesis 4:1 Go To Genesis 4
John Chrysostom
AD 407
After his disobedience, after their loss of the garden, then it was that the practice of intercourse had its beginning. You see, before their disobedience they followed a life like that of angels, and there was not mention of intercourse.