Fos immunoreactivity (Fos-IR) following exposure to the sexually conditioned odor before perfusion in males preexposed five times to a unscented female before being trained with scented females (5t UnScF), males preexposed one time to an unscented female before being trained with scented females (1t UnScF), and control males trained with scented females (CC+), in brain areas of interest. Pictures were taken accordingly to Paxinos and Watson (1998) coordinates in the mPOA: ±−0.40 mm from Bregma (A–C); Nucleus accumbens Core and Shell (NAc Core/Shell): ±1.70 mm from Bregma (core: D–F, shell: G–I); VTA: ±−6.04 mm from Bregma (J–L); the BLA: ±−3.14 mm from Bregma (M–O), and in the Central nucleus of the amygdala (CeA): ±−2.80 mm from Bregma (P–R). Abbreviations used in the figure: (3v) third ventricle, (aca) anterior commissure, (ICjM) major islands of Calleja, (RMC) magnocellular part of red nucleus, (IPDM) dorsomedial interpeduncular nucleus, (ec) external capsule, (BSTIA) intra-amigdaloid division of the bed nucleus of the stria terminalis, (LaVM) ventromedial part of the lateral amygdaloid nucleus. See Table 2 for M ± S.E.M.