Anyone familiar with the early Christian writings knows that from a very early date the churches began to oppose sex, even in marriage, for any other purpose than having children.
I think they were influenced by Greek philosophy, not apostolic teaching. Why?
I’m not sure what to say about this except that it seems that from Justin on—there’s not much to work with before him (c. A.D. 150)—there is an aversion to sex, even in marriage.
To me there’s nothing scriptural about that, and there’s some direct disagreement from Paul and the writer of Hebrews, assuming Paul didn’t write Hebrews. 1 Cor. 7 says once that a person struggling with passion should marry, and it says once that a woman shouldn’t deny her husband and vice versa. Hebrews 13 says the marriage bed is undefiled.
How much more clear can that be? And there’s just nothing to the contrary.
I know the early Christians got more and more against sex in marriage for pleasure. I think they got that from Greek philosophy, not from the Scriptures.