“You have heard that it was said, ‘You shall not commit adultery.’ But I tell you that everyone who looks at a woman with lustful intent has already committed adultery with her in his heart” (Matt 5:27-28).
God takes sexual immorality very seriously, and it often starts with lust.
People do not just wake up and decide to sin. They respond to a temptation, which is then met with another temptation. And another. Where sexual immorality is concerned, that first temptation is often lust.
The problem is not seeing an attractive person and appreciating their good looks. It’s the second look. Looking back to take it in some more. You’re saying, “I’d like me some of that.” And that’s the seed of sexual immorality. From there it’s just one more compromise, then another compromise, and you’ve done something you can’t undo.