* people who have undergone a sex-change operation cannot enter into a valid marriage, either because they would be "marrying" someone of the same sex in the eyes of the church or because their mental state casts doubt on their ability to make and uphold their "marriage" vows.<ref>http://ai.eecs.umich.edu/people/conway/TS/CatholicTSDecision.html</ref> | * people who have undergone a sex-change operation cannot enter into a valid marriage, either because they would be "marrying" someone of the same sex in the eyes of the church or because their mental state casts doubt on their ability to make and uphold their "marriage" vows.<ref>http://ai.eecs.umich.edu/people/conway/TS/CatholicTSDecision.html</ref> |