It's true in all areas of life, but seems especially severe when it comes to the area of sex and sexuality. For every Choice, a decision must be made, and for every decision, there is a result (consequence).
You REAP what you SOW. Job 4:7-9; Prov. 11:17-19; Gal. 6:7-9

Physcial Consequences…
Sexually Transmitted Disease
Unplanned Pregnancy
Addiction

Emotional Consequences
Guilt, Shame, Anguish
Lack of trust, self-esteem, self-worth

Relational Consequences
Hurt and Broken relationship with you partner as well as friends and parents
Trust issues in relationship with future spouse

Legal Consequences
Legal punisment can include substantive fines, prison, and having to register as a sex offender… this can carry with you the rest of your life!

Spiritual Consequences
Seared conscience (Titus 1:15)
Weakend ability to withstand temptation (James 1:14)
Sin separates us from God (eternally as well as currently)

Other Scriptures:
Genesis 18-19
2 Samuel 11 - 12; Psalm 51 (David & Bathsheba)
Proverbs 6:24-35
1 Corinthians 1:5