1 Corinthians 6:18
Stay away from [any involvement in] sexual immorality. Every sin a person commits is outside [the realm] of his body; but the one who commits sexual immorality sins against his own body. [Note: Possibly this means that sex, because it requires the deepest and most complete commitment of human involvement, becomes a unique sin when its true purpose and expression are violated].
1 Corinthians 15:33
Do not be fooled; bad company ruins good moral behavior.
1 Thessalonians 5:22
Avoid [the practice of] every kind of evil.
1 Timothy 5:14
Therefore, I want the younger widows to get married, have children and manage their homes, so that they do not give the enemy [i.e., non-Christians] an opportunity for speaking against [the church].
2 Timothy 2:22
But run from the evil desires of youth and pursue [the practice of] right living, faith, love and peace, along with those people who call on the Lord [i.e., in prayer] from a pure heart.
1 Peter 2:11
My dearly loved ones, I urge you, as a people who are foreigners and strangers [in this world], do not give in to sinful desires, which wage war against the soul.