Why married women continue to have a good vibrator as best friend ?

Most of the married women coming to our clinic , some survey I have done including Yahoo answers reveals that men have a major problem in satisfying women in ual act. Either it is lack of awareness of correct position or lack of interest or stress , most women do not get from as against they are happy with the masturbation. One of my friend says they should legalized marrying a vibrator in days to come ! Jokes apart, is this problem so rampant ? If so what could be the solution ? Please do not block or delete this question , I want to know serious answers.