This paper consists of two parts. In the first part, the author refutes, one by one, five objections to the legalization of same-sex marriage, including arguments grounded in naturalness, origin, reductio ad absurdum, compromising traditional marriage, and Jiang Qing’s doctrine of particular human rights. The strongest reason for advocating the legalization of same-sex marriage is the doctrine of equal rights. As contemporary people, we have no reason to deny that all individuals have equal rights. The second part discusses why Confucianism prefers heterosexual marriage. The main consideration is that same-sex marriages cannot provide ethical integrity, as heterosexual marriages do. The author emphasizes that, as a civil right, same-sex marriage can be pursued freely, but for a Confucian, heterosexual marriage is the ideal mode of marriage. The former concerns what is “right,” whereas the latter relates to what is “good.” There is an insurmountable boundary between right and good.