“Mary and Joseph did...are they too in violation of the Bible???? “
If Mary and Joseph abstained from sex after the birth of Jesus Christ, they would have circumvented God’s plan for married couples. The Bible has no teaching of perpetual virginity of Mary. Nor are there any writings from the first 100 years AD from the Apostles that teach this.
nor are there any writings against this...The Catholic church teaches it, the Catholic church is infallible, therefore I believe it.