贞操义务是专一的夫妻性生活的义务。父权家长制的产物。在父权家长制下，为了维护男系血统和财产继承的需要；法律对妻方的贞操义务十分强调，对失贞妇女的处罚也极其严厉。因此，贞操义务往往是针对妇女而言的。相反，对夫方的不贞行为却相当宽容。前资本主义，法律对贞操义务的规定仍然对妻严对夫松，中国古代，尤重视妻子的贞操义务，妻子通奸为“七出”之一。
目前理论上所提出的配偶权，以及由此生发出来的同居义务、贞操义务均无法诠释第三者的法律责任。
The theory about consortium and duty of cohabitation and duty of chastity in Marriage Law can hardly find a way to investigate the legal responsibility of a third part.
身份权上之贞操权常常为法律人所忽视，尤其是我国立法上仅仅用含糊不清的“忠实义务”来替代。
The right of chastity in the identification right law is often ignored by legal professionals, especially which is only substituted with the obscure duty of loyalty in our legislation use.
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