4:1 Now the man had marital relations with his wife Eve, and she became pregnant and gave birth to Cain. Then she said, “I have created a man just as the Lord did!”
4:17 Cain had marital relations with his wife, and she became pregnant and gave birth to Enoch. Cain was building a city, and he named the city after his son Enoch.
4:25 And Adam had marital relations with his wife again, and she gave birth to a son. She named him Seth, saying, “God has given me another child in place of Abel because Cain killed him.”