Do not lust in your heart after her beauty, or let her captivate you with her eyes (v25).
Solomon devoted a lot of time to warning against adultery. Adultery festers in the heart when it fueled by boredom, familiarity, insecurity, unreality and lust.
I have occasionally met women with captivating eyes - their every look seem to invite me in to know more. They were always shocking encounters.
Why am I blogging on this? The effects of adultery are truly awful & incalculable and as far as I can tell, none of us can inoculate ourselves guaranteeing we won't go there.
What we can do is tell our closest friends our greatest weakness, so they can look out for us. We can avoid being alone for regular, extended periods of time with members of the opposite sex.
We can guards our hearts by choosing to be satisfied with our wife/husband. And we can be confident that we will finish strong by God's grace, without minimising the clear warnings from the bible.