What is the new Church teaching regarding masturbation?
Actually, there is no new Church teaching on masturbation.
The Church has always definitively taught that masturbation is “an intrinsically and gravely disordered action” (CCC 2352). It is a corollary teaching of the sixth commandment. And when committed with full knowledge and complete consent (CCC 1859), it is a mortal sin (CCC 1854-64).
For more on this matter and living a chaste life in general, see the linked CCC passages, and see also our resources at the website Chastity.com.
By Tom Nash