Is the emotion of sexual passion a result of the fallen state? (Catholic perspective)

I found very good information on this site where the author logically and according to the **Catholic teaching** explains certain parts of sexual behavior. I agree and practice what is written, just in case if someone wonders if it's even possible. But I don't want to discuss whether the site or the author is correct on the subject so please avoid any comments on the authenticity of the site. There is a statement: > Now the emotion of sexual passion is a result of the fallen state, and > so neither Jesus nor Mary experienced sexual passion or sexual > arousal. What is the source of this knowledge or where does the author bases this information from?