Nedarim 81B

שלא מצינו שועל שמת בעפר פיר.

And it cannot be argued that if the woman refrains from bathing or adorning herself, it will negatively impact on her relationship with her husband, as we do not find a fox dying in the earth of the lair to which it is accustomed. Similarly, a husband who is accustomed to his wife will not come to avoid having sex with her merely because she has not bathed.

תניא כוותיה דרב אדא בר אהבה: דברים שיש בהן עינוי נפש ⁠— מפר, בין בינו לבינה, בין בינה לבין אחרים. שאין בהן עינוי נפש בינו לבינה ⁠— מפר. בינה לבין אחרים ⁠— אינו מפר. כיצד? אמרה ״קונם פירות עלי״⁠ — הרי זה יפר. ״קונם שאיני עושה לפי אבא״, ״לפי אחיך״, ״לפי אביך״, ״לפי אחי״, ו״שלא אתן תבן לפני בהמתך ומים לפני בקרך״⁠ — אין יכול להפר.

The Talmud comments that it is taught in a baraita in accordance with the opinion of Rav Adda bar Ahava: Vows taken by a woman concerning matters that involve affliction the husband can nullify, whether they relate to matters between him and her or to matters between her and others. As for vows concerning matters that do not involve affliction, if they relate to matters between him and her, he can nullify them, but if they relate to matters between her and others, he cannot nullify them. How so? If she said: Produce is konam for me, he can nullify the vow, as it falls into the category of vows of affliction. If, however, she said: I will not prepare anything for my father, as that is konam for me or: For your brother, or: For your father, or: For my brother, or: I will not place straw before your animal, or: I will not place water before your cattle, he cannot nullify such vows, as they do not touch upon the relationship between husband and wife, nor do they cause her affliction.