The majority of unwanted pregnancies in Iran are due to withdrawal failures. This study seeks to explore factors associated with withdrawal use, which is highly prevalent among Iranian married couples. Multivariate logistic regression analyses are employed to estimate the likelihood of using withdrawal rather than modern contraceptives among a representative sample of 6199 Iranian married women using contraception, taken from the 2000 Iran Demographic and Health Survey. Among other findings, women's fertility intentions strongly interacted with women's parity, number of son, and wealth status, where birth limiters with a lower wealth status, lower parity, and no son were more likely to use withdrawal rather than modern contraceptives. Other results showed that higher education levels and economic status were strongly associated with the greater likelihood of using withdrawal rather than modern contraceptives. Women who lived in urban areas and were unemployed and who had a smaller number of children were more likely to use withdrawal rather than a modern contraceptive method. Compared with younger women, those aged 40-49 were more likely to use withdrawal than modern methods. A reduction in unwanted pregnancies can best be achieved by improving the current family planning program in regions and among subgroups of the population who regulate their fertility by using withdrawal