What is the male  superior  or the missionary position and when it is not advocated: The basic missionary position, also called  the matrimonial position, is the  face-to-face position with the man astride.  The men and woman lies on her back with her  legs. 

It makes entry  easy and facilitates the man's  the pelvic thrusts.  It allows flexibility and sexual intercourse   can be shallow and  tender  or deep and tough, in accordance  with mutual  desires.  The only disadvantage here is  that some  women may experience  pelvic discomfort and inability to move  as most of the weight  is borne by the female  partner.

It is best to avoid   this position and the opposite of the missionary position just mentioned, i.e., face to face with the woman  above can be helpful.