Radioligand binding studies were used to analyze the interactions of six "prosexual" drugs with 5-hydroxytryptamine1A (5-HT1A) and alpha 2-adrenergic receptors in rat brain membranes. Three drugs that facilitate seminal emissions and/or ejaculations [8-hydroxy-2-n-propylaminotetralin (8-OH-DPAT), 5-methoxy-dimethyltryptamine, and RDS-127] are potent and selective inhibitors of [3H]8-OH-DPAT...