The genital areas are generally moist and warm environments-ideal for the proliferation of yeasts, viruses and bacteria. Examples of sexually transmitted infections (STIs) include: 1  Chlamydia. 2  Chancroid. 3  Crabs (Pubic Lice). 4  Genital herpes. 5  Genital warts. 6  Hepatitis B. 7  HIV / AIDS. 8  Human Papillomavirus (HPV).