Some people - it seems to me - need sex and some don't need it, at least not as much. Various factors probably contribute to this. Genes maybe. Bringing up. Modeling of parents. Early sexual experiences. Etc. Some of those priests that got involved in sex apparently could not resist impulses that can overpower. Very sad in their situations. They have brought major scandal to the church. One good reason for marriage.
Since so many of the priestly scandals involved teenage boys, this brings up a complex issue. I'm inclined to think that homosexuality is either given by God (born with) or the result of childhood factors. The exploitation of teenage boys is inexcusable, to be sharply condemned as a crime. However, I've finally concluded that probably civil unions should be permitted. Better to be in a committed relationship than to be promiscuous, whether male or female. Better for the individual and for society.
There are some people, certainly among priests and nuns, who apparently find that they can get along without sex, in large part because of their devotion to God. Frankly, sometimes religion can seem erotic. Some of the saints - females especially - wrote about Jesus as though he were their lover. Many hymns have a certain erotic tone. Take the old Protestant one, now often sung by Catholics: "And he walks with me and he talks with me, and he tells me I am his own...." Many more like that. I wonder if religion doesn't fill the vacuum which the absence of physical love (and sex) brings.
So, the answer - yes to some, no to many others. I believe the church should permit priests to marry if they choose to. The Bible certainly permits it. It is generally healthier for the spirit as well as the body than being forced to remain single. The natural man and woman want and need love, and physical love usually leads to sex. Nothing wrong with that within the bonds of marriage. Wasn't God's first commandment: "Be fruitful and multiply!"
Kidding but here goes. Who was the wisest man in the world, according to scripture? Solomon! He had 700 wives and 300 concubines! And all those patriarchs, favored by God, men like Abraham and Isaac, Jacob and David etc had more than one wife, or, in the case of Abraham, a wife and a mistress! And Jesus, after all, performed his first miracle at a wedding!