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  1. Sexually transmitted diseases (STDs) - Symptoms and causes

  2. CDC - STD Diseases & Related Conditions

  3. Sexually transmitted disease (STD) symptoms - Mayo Clinic

  4. Sexually transmitted infections (STIs) - World Health Organization

  5. Sexually transmitted infection - Wikipedia

  6. Sexually Transmitted Infections - Cleveland Clinic

  7. Sexually transmitted infections | Office on Women's Health

  8. Sexually transmitted diseases (STDs) - Mayo Clinic

  9. Sexually Transmitted Diseases - Information from CDC

  10. Sexually transmitted infections (STIs) - World Health Organization