title: Serum testosterone concentration and penile tumescence changes in men.
mesh_terms: D000328:Adult; D006801:Humans; D008297:Male; D010413:Penis / Q000502:physiology*; D012725:Sexual Behavior / Q000502:physiology; D013739:Testosterone / Q000097:blood*; D013997:Time Factors
chemical_list: D013739:Testosterone