[Unsolved problems in reproductive behavior (author's transl)].
D000328:Adult; D000367:Age Factors; D001723:Birth Rate; D003710:Demography; D005860:Germany, West; D006801:Humans; D011606:Psychosexual Development; D012098:Reproduction; D012725:Sexual Behavior; D012961:Sociology
Ungelöste Probleme des generativen Verhaltens