It is not mandatory to get tested before having oral sex, but it is highly recommended, especially if it is with a new partner or if either of you have had sexual relations with someone else without being tested. Most sexually transmitted infections are asymptomatic and can be transmitted through any type of sexual activity. It is important to get tested regularly, and you can do so by contacting your family doctor or local health center. In some areas, there are free phone lines that provide direct access to STI testing appointments.