Answer:
Many people seem confused about the difference between priests and monks.
All monks and nuns took four vows: poverty, chastity, obedience and stability. Poverty meant that they could never own anything of their own; chastity meant that they could not marry or have any relationship with the opposite sex; obedience meant unquestioning obedience to the Rule of St Benedict and to the Superior of their monastery or nunnery. Stability meant that they would never leave the monastery or nunnery without permission and would always live the cloistered life.
Priests were not bound by oath, but chastity was part of the conditions of becoming a priest, regulated by Canon Law. Many ignored the regulations and got married anyway.