That is proof of corruption, not proof that continence for clerics was not the norm.
Why is it corruption for a priest to be married?
God created Eve because He did not want Adam to be alone. Further, the Good Lord commands us to be fruitful and multiply.
In addition, a married clergy was not only considered normal practice in the Old Testament, it is also specifically permitted in the New Testament.
May I refer you to 1 Timothy 3:2
“A bishop then must be blameless, the husband of one wife, vigilant, sober, of good behavior, given to hospitality, apt to teach.”