God designed sex with boundaries and purposes. The boundary of sex is marriage, in which a man and woman become one flesh in a lifelong bond (Genesis 2:24; Mark 10:9). Pornography violates this by inviting us to enjoy sex outside of marriage. Sean McDowell, General Editor of The Apologetics Study Bible for Students, briefly explains some specific reasons why pornography is bad by exploring its potentially dire effects on our minds and our lives. (Check out the article on page 752 in The Apologetics Study Bible for Students.)