text: That sounds horrible!  If she has been diagnosed with an STD, it is reported to the Department of Health. If she knowingly infects someone else and they become infected; they MAY be able to take legal action only if they have proof it was from her. This is difficult because you cannot always prove "when" you were infected. Tell your friend to go to the doctor and seek treatment. Most STDs are curable, but if left untreated many side effects including infertility can occur.