“…Over the last decade, studies using Fos as a marker of activation (Curran and Morgan, 1995;Hoffman and Lyo, 2002;Morgan and Curran, 1991), provided extensive information about the involvement of the brainstem, the caudal thalamus, the amygdala, the bed nucleus of the stria terminalis, and the medial preoptic area in ejaculation, as well as in preceding elements of male sexual behavior in the rat (Baum and Everitt, 1992;Baum and Wersinger, 1993;Coolen et al, 1996Coolen et al, , 1997aCoolen et al, ,b, 1998Heeb and Yahr, 1996;Kollack and Newman, 1992;Pfaus et al, 1993;Veening and Coolen, 1998;Veening et al, 2005). Specific neuropeptides like Galanin, cholecystokinin and Substance P play a role in this neural circuitry (Coolen et al, 2003a,b;Polston and Simerly, 2003).…”