Why are STIs (sexually transmitted infections) so prevalent?
In most cases, such diseases are transmitted by people who have no signs or symptoms. In addition, contraceptive methods like the birth control pill and IUD (intrauterine device) provide no protection against STIs, unlike the barrier methods (e.g., condoms). The number of partners, having sexual relations during trips or while under the influence of illicit drugs and/or alcohol are also increased risk factors.