There are conditions that predispose to infection. In fact women and adolescents are more vulnerable. Teenagers are especially vulnerable because the virus is transmitted more easily in more immature and receptive tissues. What can you do to avoid it? Infection occurs during unprotected sexual through contact between the mucous membranes (mouth and genitals) and between these and the infected body fluids (semen, blood and vaginal secretions).
Condom is the only effective method of prevention as it acts as a barrier that prevents the passage of infections.