Safeguard your heart and mind

This is essentially the point of Matthew 5:27-28.

Let's look at sexuality from God's perspective. He wanted to create a powerful, intense union between a man and a woman (marriage) after the pattern of the relationship between His Son and His Church. This union needed to be more than just the male and female body copulating -- after all, that's all animals really have. And it IS so much more, or should be, just read Genesis 2. It is a relational, spiritual union between two hearts. Song of Solomon is incredibly erotic, but its power comes from its foundation -- the intense love between the man and the woman has as its foundation an unconditional, covenant love (look at Song of Solomon 8:6-7).

To have this kind of love is so much more than body. It is a love that demands loyalty of the heart, and a passion of the mind. The intensely devoted and passionate sexuality that God wants all married people to have means it is exclusive -- one man, one woman, no others.

Imagining sex with others, "erotic" fantasy relationships with fantasy men or fantasy women, is betraying your spouse, rebellion against a loving God, and cheating yourself horribly. There are only two places it can go: a dead end of frustration (because our spouse won't match up to our foolish fantasy person or situation), selfishness, and misery (because now we're saying God is not good)... OR it ends up in actual adultery -- which puts the body where the brain and the heart have already gone and breaks the bond between man and wife, often beyond repair.

How utterly sad.

Jesus really does know what's best for us. He knows well God's plan for wonderful sexuality between man and woman. He tells all who want to live as Citizens of Heaven to "lock up" their hearts and minds, with regard to sex. Give the keys to your spouse, and to God.

This is the way a disciple lives -- thanking God for his goodness, and having the faith in His goodness that leads to faithfulness.