What would be a reason for Vatican to hide something then? We can only take a guess. It could be also about sex. What do you think, why do priests live in celibacy? So their children (if they had any) can't inherit from them. Very ingenious!To fulfill some Biblical prophecies regarding evil doctrines that would occur in the Church.
1. Celibacy
2. Abstinence
The Bible has been vocal that these 2 doctrines are of evil's commandments.