Drink water from your own cistern, running water from your own well.
Should your springs overflow in the streets, your streams of water in the public squares?
Let them be yours alone, never to be shared with strangers.
May your fountain be blessed, and may you rejoice in the wife of your youth.
A loving doe, a graceful deer—may her breasts satisfy you always, may you ever be intoxicated with her love.
Why, my son, be intoxicated with another man’s wife?
Why embrace the bosom of a wayward woman?
For your ways are in full view of the LORD, and he examines all your paths.
The evil deeds of the wicked ensnare them; the cords of their sins hold them fast.
For lack of discipline they will die,
led astray by their own great folly.
(Proverbs 5:15-23)

Sex is a gift for your spouse.

But if they cannot control themselves, they should marry, for it is better to marry than to burn with passion. (1 Corinthians 7:9)

Sexual sin is never safe.

If your right eye causes you to stumble, gouge it out and throw it away. It is better for you to lose one part of your body than for your whole body to be thrown into hell. And if your right hand causes you to stumble, cut it off and throw it away. It is better for you to lose one part of your body than for your whole body to go into hell. (Matthew 5:29-30)

Self-control starts when you’re single.

Therefore confess your sins to each other and pray for each other so that you may be healed. The prayer of a righteous person is powerful and effective. (James 5:16)

Charm is deceptive, and beauty is fleeting;
but a woman who fears the LORD is to be praised.
(Proverbs 31:30)