Sexually Transmitted Diseases (STDs) or Sexually Transmitted Infection (STI) or Venereal Disease (VD) are diseases that are mainly passed from one person to another (that is transmitted) during sex. There are at least 25 different sexually transmitted diseases (Like 1) Syphilis, 2) Gonorrhea, 3) Chancroid, 4) Genital Herpes, 5) HIV/AIDS, 6) Human Papillomavirus (HPV), 7) Lymphogranuloma Venereum (LGV), 8) Bacterial Vaginosis, 9) Chlamydia, 10) Trichomoniasis, 11) Hepatitis B & 12) Hepatitis C) with a range of different symptoms. These diseases may be spread through vaginal, anal and oral sex.