An STD is an infection that you get from someone else by having sex. You can get an STD by having vaginal sex (penis in the vagina), anal sex (penis in the rectum), or oral sex (penis in the mouth ...

Herpes on the penis looks like clusters of small, fluid-filled blisters. After the initial outbreak, the sores can recur during moments of illness, stress, or fatigue. This article discusses the signs ...