Chapter 42 Had Elizabeth’s opinion been all drawn from her own family, she could not have formed a very pleasing opinion of conjugal felicity or domestic comfort.
She had always seen it with pain; but respecting his abilities, and grateful for his affectionate treatment of herself, she endeavoured to forget what she could not overlook, and to banish from her thoughts that continual breach of conjugal obligation and decorum which, in exposing his wife to the contempt of her own children, was so highly reprehensible.
There are no more uses of "conjugal" in the book.
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That day I received a letter from my benefactor in which he wrote about "conjugal duties."
Leo Tolstoy -- War and Peace
I start noticing small signs of conjugal existence.