Married people have less satisfying sex lives than single people who have sex with as many as they desire: Proverbs 5:18-20; 23:27 (Married couples have sex more frequently and enjoy better quality sex, than those living common law, or sexually active singles.)
I can say no to my spouses sexual advances because I control my own body: (In marriage, each spouse controls the other spouse's body. This means that if your spouse wants sex, you sin if you just say no. This is a powerful teaching of the Holy Spirit that guards against adultery. See: 1 Cor 7:4-5)
Pornography, even if both husband and wife agree to view it, has no detrimental affect upon the marriage relationship: Matthew 5:28
