The argument is not that facil. The question is how many St. Pauls do we have out there? The expectation that sexual super athletes are best able to lead to the Lord to me denies the existence of a gift of human desire. In perpetuating this denial, the church has made the invitation of ordinaton to nearly nobody. The inevitable and demonstrable result is that the priesthood attracts those who wish to completely deny their submission to temptation and who are transfixed by acheiving abstenance and the validation of ordination, all while containing and concealing an uncontrollable desire. You are right that marriage would not change such an person, who would never be worthy of ordination. But, why should the chuch make itself attractive to such a person?
Gosh, we sure have attracted a lot of nobodies for centuries and centuries and centuries and centuries and centuries and centuries and centuries and centuries and centuries and centuries and centuries and centuries and centuries and centuries and centuries and centuries and centuries and centuries and centuries and centuries et in saecula saeculorum. Amen