When do monks take a vow of celibacy?

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Catholic AnswerThe Evangelical counsels: poverty, chastity, and obedience are the proposed to every Christian by Our Blessed Lord. In other Words, if we are to be a Christian, if we are to dare to say that we are following Christ, we must discern how to follow these counsels of Our Blessed Lord. The monk is giving himself entirely to God, holding nothing back, he is giving up control of absolutely everything in his life to God while he is still no this earth. He no longer has any decision to make, he only has to follow the Gospel, his particular rule of his community, and the Abbot's orders. Chastity is not something negative, it is something positive. He is giving up having one specific person to love in his life other than the Lord, and taking the Lord, and His Mystical Body - the Church, as his spouse. A spouse works out his salvation by loving his wife, a monk works out his salvation by loving the Bride of Christ, which is the Church. He is not giving something up, he is taking on more.

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By the way, a monk's vows are obedience, stability, and conversatio morum. The last "conversion of manners" contains both chastity and poverty, he does not take specific vows of either of these two, just the conversatio morum.