Yes, watching pornography is considered a sin in Christianity. Pornography is defined as any material that depicts nudity or sexual behavior in a way that is designed to promote sexual arousal.
The Bible speaks clearly on the issue of lust and immorality. In Matthew 5:28 it states “But I tell you that anyone who looks at a woman lustfully has already committed adultery with her in his heart.” And in 1 Corinthians 6:18 the Bible says, “Flee from sexual immorality. All other sins a person commits are outside the body, but whoever sins sexually, sins against their own body.” These verses demonstrate that lust and immorality are not accepted by God.
By watching pornography, Christians are allowing their minds and hearts to be tempted by immoral desires which is not what God calls us to engage in. Therefore, it is clear that watching pornography is a sin in the eyes of God.
In conclusion, pornography is a violation of Christian values and goes against the teachings of the Bible. It can lead to addiction, create an unrealistic view of sexuality and cause one to compare themselves to media depictions, leading to dissatisfaction and jealousy within a marriage or other relationship.