For the source text click/tap here: Ketubot 61
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This mishnah teaches that a husband has an obligation to have sexual relations with his wife.
How frequently he is obligated depends on his job.
The idea that a husband has an obligation to periodically have relations with his wife is derived from Exodus 21:10 which states that if a man takes a second wife he cannot diminish from her three things: food, clothing or conjugal rights.
A man cannot make a vow to forbid upon his wife anything which he is mandated to give her by law.
The man in this mishnah, perhaps in a fit of anger, forbade his wife from have sexual relations with him.
This is not permitted and if he does not have his vow annulled
We review the Mitzvah on onah and the asymmetry of obligation between the man and the woman.
Finally some recent literature on religion and sexuality ending with some confessional writing.