'Sexual' in the Bible

Later, Adam had sexual relations with his wife Eve. She became pregnant and gave birth to Cain. She said, "I have given birth to a male child the LORD."

Later, Cain had sexual relations with his wife. She became pregnant and gave birth to Enoch. Cain founded a city and named it after his son Enoch.

Later on, after Adam had sexual relations with his wife, she gave birth to a son and named him Seth, because "God granted me another offspring to replace Abel, since Cain murdered him."

The Nephilim were on the earth at that time (and also immediately afterward), when those divine beings were having sexual relations with those human women, who gave birth to children for them. These children became the heroes and legendary figures of ancient times.

So they had their father drink wine that night, and the older one had sexual relations with her father, but he was not aware when she lay down or when she got up.

The woman was very beautiful, young, and had not had sexual relations with a man. Going down to the spring, she filled her jug and turned for home.

But while Israel lived in that land, Reuben went inside his father's tent and had sexual relations with his father's concubine Bilhah, and Israel heard about it. Now Jacob had twelve sons.

There Judah met the daughter of a Canaanite man named Shua. He married her, had sexual relations with her,

So Judah instructed Onan, "You are to have sexual relations with your dead brother's wife, performing the duty of a brother-in-law with her, and have offspring for your brother."

But Onan knew that the offspring wouldn't be his own heir, so whenever he had sexual relations with his brother's wife, he would spill his semen on the ground to avoid fathering offspring for his brother.