Gonorrhea ("the clap")
Gonorrhea is one of the most common sexually transmitted infections (STIs). Typical symptoms include a pus-like or watery discharge from the penis, vagina or anus. The infection can usually be treated effectively with antibiotics. If left untreated, it can cause serious problems.
Pubic lice
Pubic lice can be detected because they cause itching and leave blueish-gray or red bite marks. They are most commonly found in the pubic hair. You can catch them through close body contact, usually during sex. You can get rid of these parasites quickly with special lotions and creams.