The motorcycle syndrome.
D000063:Accidents, Traffic; D000328:Adult; D000374:Aggression; D003220:Conflict, Psychological; D004532:Ego; D007172:Erectile Dysfunction; D005239:Fear; D006716:Homosexuality; D006801:Humans; D007062:Identification, Psychological; D007175:Impulsive Behavior; D008297:Male; D010287:Parent-Child Relations; D010551:Personality; D012649:Self Concept; D012725:Sexual Behavior; D013334:Students; D013561:Symbolism