STD Sexually Transmitted Diseases Sexually transmitted diseases or STD are infections that are typically, but not exclusively, transmitted from human to human through sexual contact. Sexually transmitted diseases (STD), now called sexually transmitted infections (STI) are infectious diseases are infections caused by bacteria, viruses and parasites and transmitted through sexual contact. Sexually transmitted diseases (STDs) … Continue reading STD – STI | List of Sexually Transmitted Diseases and Infections