Answer:
He married Katherine van Bora in a private ceremony without practically any announcement.
Step-by-step explanation:
This raised certain moral questions, as clerical marriage was in that period was something that was not so usual. This presented a treat, because Luther was a leader of a religious movement. Catholic church used this to present Luther as immoral person. Still, reformers saw Luther's act as an act of faith and it didn't affected his further work.