Sexual behavior may be altered during pregnancy. The authors aimed to investigate the behavior of pregnant women in terms of level of sexual initiative and change in sexual positions for intercourse. The authors conducted a retrospective research with 156 pregnant Brazilian women who completed a questionnaire. Before pregnancy, both partners usually initiated sex, whereas during pregnancy, the male partner generally did. In general, women who took the sexual initiative showed better scores in the sexuality variables. During pregnancy, the use of each sexual position reduced significantly. Couples in which both partners take the sexual initiative tend to accept a wider variety of sexual positions.