title: Plasma testosterone levels and sexual activity in a male subject.
mesh_terms: D002940:Circadian Rhythm; D003075:Coitus; D004542:Ejaculation; D006801:Humans; D006854:Hydrocortisone / Q000097:blood; D008297:Male; D012725:Sexual Behavior; D013739:Testosterone / Q000097:blood*
chemical_list: D013739:Testosterone; D006854:Hydrocortisone