Sexual motivation quantified in females treated with Tamoxifen (TAM - dark grey) or vehicle (VEH - white) before, during and after the treatment in the approach test (A, mean of all sessions per period) and in the partner preference test (C, one session per period). Females treated with TAM spent less time near the male compared to controls. During the treatment, the percentage of females approaching the male was lower in TAM treated-females compared to control (B). In the partner preference test, the total time spent near a congener (time near female + time near male) during the treatment did not differ between groups (D). * p < 0.05, ** p < 0.01, *** p < 0.001 compared to VEH. (#) p < 0.1 compared to corresponding group during “before” period. p values are adapted with the Bonferroni correction when appropriate.