Sex vs. Christianity

[Zen Badger]

And for good reason, according to the account there were only three people in the whole world, yet Cain was able to find a wife.

Not true, I suggest you re-read the Bible if you make claims like that.

From the KJV

4:15 And the LORD said unto him, Therefore whosoever slayeth Cain, vengeance shall be taken on him sevenfold. And the LORD set a mark upon Cain, lest any finding him should kill him.
4:16 And Cain went out from the presence of the LORD, and dwelt in the land of Nod, on the east of Eden.
4:17 And Cain knew his wife; and she conceived, and bare Enoch: and he builded a city, and called the name of the city, after the name of his son, Enoch.