Fos immunoreactivity (Fos-IR) following exposure to the sexually conditioned odor before perfusion in males preexposed five times to the odor before being conditioned with scented females (5t ScF), in males preexposed one time before being conditioned with scented females (1t ScF), and control paired males conditioned with scented females (Control ScF), in brain areas of interest. Pictures were taken accordingly to Paxinos and Watson (1998) in the medial preoptic area (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); Ventral tegmental area (VTA): ±−6.04 mm from Bregma (J–L); the Basolateral amygdala (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) 3rd ventricle, (aca) anterior commissure, (ICjM) islands of Calleja major islands, (RMC) magnocellular part of red nucleus, (IPDM) dorsomedial interpeduncular nucleus, (ec) external capsule, (BSTIA) intraamigdaloid division of the bed nucleus of the stria terminalis, (LaVM) ventrolateral part of the lateral amagindaloid nuleus. See Table 1 for mean ± S.E.M. and text for statistical comparisons.