Eve has a description. It doesn’t just say, Adam knew a girl named Eve.
Are you kidding? Oh, no, the Word of God doesn’t say that! It says, “And Adam knew Eve HIS WIFE;” (Genesis 4:1a KJV – capitalization is mine)
“And” shows that there were necessary events that had to occur before Adam “knew” his wife (the girl had to be publicly declared as “his wife”) and the semi colon (;) shows that “knowing” (making love, NIV) is not the end in and of itself. There is more blessing following it, depending on at what stage “the knowing” occurs.