Among        older     people,     if  sex    is  given     up   altogether      for    some  months   for  various  reasons  such   as  illness,   they  can   lose  interest   in  it  permanently .        Masturbation        is   recommended         in   such  cases .    •       In  America ,     women       retain   their  interest    in  sex   much     longer   than  men .    In   the   age   group   of 50   to   90,   the   overwhelming   majority   of  women   give   up   sexual   intercourse   only   because  their   husband s   are  no   longer   willing      or   able   to   have   sex.  Men ,   however ,     give   up  sex  much      earlier   because   of   impotence ,        illness   and   lack   of   interest .   •      It   is   quite   wrong   to   say   that   some   people   are   undersexed   or   over-  sexed.      Nothing      can   be   further    from     the   truth .  These     things    are  only      psychological .        With     rare    exception...