司法院大法官會議第147號解釋 (J.Y. Interpretation No. 147)

Article 1001 of the Civil Code provides that spouses have a “mutual marital obligation to cohabit” absent legally justifiable reasons for not cohabiting. The Court held that a husband’s extramarital affair violates the “marital obligation of fidelity” and qualifies as a legally justifiable reason for the wife not to cohabit with the husband. Thus, the Court held that a husband’s extramarital affair releases his wife from her marital obligation to cohabit, but only for the period during which he maintains the affair.

民法第1001條規定，配偶如果欠缺法律上合理的不同居理由，就有 「婚姻同居義務」。法院認為，丈夫納妾違反了 「婚姻忠誠義務」，妻子可以之作為不與丈夫同居的合法理由。因此，法院認為，丈夫納妾可以免除妻子的婚姻同居義務，但只限於在他撫養妾的期間。