Is masturbation an offense against love?
Masturbation is an offense against love, because it makes the excitement of sexual pleasure an end in itself and uncouples it from the holistic unfolding of love between a man and a woman. That is why “sex with yourself” is a contradiction in terms. The Church does not demonize masturbation, but she warns against trivializing it. In fact many young people and adults are in danger of becoming isolated in their consumption of lewd pictures, films, and Internet services instead of finding love in a personal relationship. Loneliness can lead to a blind alley in which masturbation becomes an addiction. Living by the motto “For sex I do not need anyone; I will have it myself, however and whenever I need it” makes nobody happy.
What is meant by “fornication”?
Fornication (from Greek porneia) originally meant pagan sexual practice, for instance, temple prostitution. Later the term was applied to all forms of sexual activity outside of marriage. Today in English it generally refers to consensual sexual relations between an unmarried man and an unmarried woman. Fornication is often based on seduction, lies, violence, dependency, and abuse. Fornication is therefore a serious offense against charity; it harms the dignity of the person and fails to recognize the meaning of human sexuality. Civil authorities have the duty to protect minors especially from fornication.
Dig Deeper: CCC section (2352-2353)