Sexually transmitted diseases (STDs) are major health problems in many parts of the world, especially in developing countries, as illustrated by high prevalence rates and a high rate of complications and sequelae. STDs are medically, socially and economically important, mainly because of their sequelae, which hit women and neonates in the first place. Ectopic pregnancy, spontaneous abortion and stillbirth, prematurity and low birth weight, congenital and perinatal infections, and puerperal maternal infections represent outcomes of pregnancy in which STDs play important aetiological roles.