Contraception with the IUD is definitely on the increase in France where, in January 1978, there were about 850,000 users. According to the authors of this article the IUD is an excellent contraceptive method, except in the case of nulliparous women, who seem more susceptible to complications caused by IUDs. A survey of the published literature shows that uterine perforation is easier in nulliparous women, and that expulsion is more frequent, as is removal for reasons of bleeding and pain, and as unwanted pregnancy resulting from IUD failure. More importantly, frequency of infection is higher among nulliparous IUD wearers; it must be remembered that serious infection often leads to sterility. As a result of such findings nulliparity must be regarded as an absolute contraindication to the use of an IUD unless no other contraceptive choice is possible.