Jesus regularly taught about the law of the seed through praying, giving, or lusting. The ongoing lust of a woman or women in general has the DNA of unfaithfulness. The moment you break away from your covenant of forsaking all others, you create lustful, sexual interactions with this woman - real, imagined or fantasy. You begin to attach to her in an inappropriate manner. If you masturbate to this image, you have sexually reinforced behavior to this person, image or fantasy in your mind and heart.
Lusting is being unfaithful to God, your wife and to yourself. The DNA of unfaithfulness and lust is sin and death (James 1:15). If you know a seed is a weed, why would you call it anything other than a weed? Why would you intentionally plant a weed in your mind, heart and sexuality that is guaranteed to hurt you in so many ways? Lust, in its core, carries the DNA of adultery from start to finish. So don’t be lied to that planting an apple seed isn’t planting an apple.