HPV
By far the most common virus transmitted between people. According to Marla Ahlgrimm, HPV is the virus that causes genital warts. However, it does not always show signs, and the vast majority of people spread it without ever knowing they have it.
Herpes
You’ve probably heard of herpes, but do you know what it does? Marla Ahlgrimm explains that herpes is responsible for common cold sores and fever blisters. The sexually-transmitted variant can also cause genital blistering. Alarmingly, herpes can have a significant negative impact on a developing fetus, particularly if a woman becomes infected within the first 12 weeks of pregnancy.