Sexually transmitted infections (also called STDs) are infections that you can contract during sexual contact with a person who is infected. These are not always symptomatic, so that they can sometimes be passed on without the infected person being aware of this. If symptomatic, they can cause a series of complaints, the most common of which are: discharge or pus from the vagina, penis or anus, pain or burning sensation when urinating, genital sores, ... The diagnosis can be made at the clinical examination (for example condylomas) or with a simple urine test. Treatment will depend on the type of condition. When contracting an STD, prevention is important to further spread: abstinence or protected sexual contact with a condom is the only way to prevent the condition from being passed on.