What does the Church teach about the human body?
Questions Covered:

18:32 – If a person’s soul leaves his body, is it still the same person? Is that body a different person at that point? 
34:12 – Besides DNA, human bodies are made up of the same elements, one of them being water. How does the Church determine the uniqueness of each person, besides seeing that their DNA is different? 
44:50 – I think there are some people in the secular world making the same realizations about sexual ethics and the human body that the Catholic Church has already established. I think if they investigate further, they will find that the Church is teaching the same things that they are discovering. 

Resources Mentioned:
What is a Human?