מתני׳ המדיר את אשתו מתשמיש המטה ב"ש אומרים שתי שבתות בית הלל אומרים שבת אחת התלמידים יוצאין לתלמוד תורה שלא ברשות שלשים יום הפועלים שבת אחת העונה האמורה בתורה הטיילין בכל יום הפועלים שתים בשבת החמרים אחת בשבת הגמלים אחת לשלשים יום הספנים אחת לששה חדשים דברי רבי אליעזר:
MISHNA: With regard to one who vows that his wife may not derive benefit from marital relations with him, Beit Shammai say: He may maintain this situation for up to two weeks, but beyond that he must divorce her and give her the payment for her marriage contract. Beit Hillel say: He must divorce her if it continues beyond one week. Apropos the husband’s obligation to his wife regarding marital relations, the Gemara mentions other aspects of this issue: Students may leave their homes and travel in order to learn Torah without their wives’ permission for up to thirty days, and laborers may leave their homes without their wives’ permission for up to one week. The set interval defining the frequency of a husband’s conjugal obligation to his wife stated in the Torah (see Exodus 21:10), unless the couple stipulated otherwise, varies according to the man’s occupation and proximity to his home: Men of leisure, who do not work, must engage in marital relations every day, laborers must do so twice a week, donkey drivers once a week, camel drivers once every thirty days, and sailors once every six months. This is the statement of Rabbi Eliezer.
-Iggeret ha-Kodesh, 13 C.
When a man has taken a bride, he shall not go out with the army or be assigned to it for any purpose; he shall be exempt one year for the sake of his household, to give happiness to the woman he has married.
(יד) תַּשְׁמִישׁ הַמִּטָּה מֵעֹנֶג שַׁבָּת הוּא. לְפִיכָךְ עוֹנַת תַּלְמִידֵי חֲכָמִים הַבְּרִיאִים מְשַׁמְּשִׁין מִלֵּילֵי שַׁבָּת לְלֵילֵי שַׁבָּת.
Sexual relations are considered a dimension of Sabbath pleasure. Therefore Torah scholars fulfill their marital obligations once a week, on the Shabbat.