Sexual receptivity quantified in females that approached the male during the period when they were treated with Tamoxifen (TAM - dark grey) or vehicle (VEH - white). Data are shown separately for the periods before, during and after the treatment. During the approach test (A – experimental female in grey) when compared to controls females treated with TAM showed fewer crouching responses (B, expressed as a percentage of the number of approaches of the male) and more male avoidance (C, expressed as a percentage of the number of approaches of the male). (*) p < 0.1, * p < 0.05, ** p < 0.01 compared to VEH. (#) p < 0.1 compared to corresponding group during “before” period. p values are adapted with the Bonferroni correction when appropriate.