Only priests may preach during Mass. Laymen and women are free to preach at other times.
Why can’t priests marry? Priests used to be able to marry until the church and the wives disagreed over the priest & wifes’ property when the priest died.
This is a liberal urban legend. The norm for priests has always been celibacy. While celibacy was not always required as a discipline, consider that married priests had to abstain from the marital act. Even in the Eastern particular churches, only celibates may be ordained to the episcopacy, and married priests have many challenges balancing their family and parish. Celibacy is a wise discipline.
Why can’t a Catholic nun be married and be recognized?
That makes no sense. The nature of a nun is to be a celibate. You can't be a celibate if you want to marry. If you want to do charity work, who's stopping you? You can even join a religious order as a lay affiliate:
Third Order of Saint Dominic
The National Fraternity of the Secular Franciscan Order - USA
“Only priests may preach during Mass. Laymen and women are free to preach at other times.” -
That’s the question.
“This is a liberal urban legend”
Absolutely wrong.
“The nature of a nun is to be a celibate.”
The tradition of a nun is to be a celibate - the nature of a nun is to do the work of the church.