Yes, of course. Reverend Fathers, you call, or Priests are still human. Even if they made their vow of Celibacy, it does not mean they forget about their being human.
What most people think is that after a priest is ordained, they are not allowed to do what we ordinary people can do. Actually, what they are not only allowed is to marry and to have sexual relations, which is what CELIBACY means. The fact that they chose to be celibate does not mean that their animalistic behavior will cease to exist.
Now, priests' vow of Celibacy is like the marriage vows when we get married. When we get married, we promise to live with our wife and to satisfy our sexual desire only with our wife, right? But, I ask you, have you not fantasized on other girls?
Also, Celibacy is similar to Fasting where we abstain from any food or drinks, be it for religious or medical reasons. But, does it mean the person Fasting will not go Hungry?
For me, it is not a sin having a sexual urge. Everyone experiences it, even animals. It only becomes a sin when you do an immoral thing to satisfy that urge.