The origin of this most common sexual position may be found in history of the mankind.
The primitive man had possibility risk of being attacked by enemies or predators and being caught unaware while being in the sexual act. Hence, face-to-Face position was probably the quicker way of ensuring reproduction without risking life.
With more secured surrounding, couples today have ample opportunity to share sexual pleasures and try out other mutually satisfactory positions. Change in positions will also prevent the sexual act from becoming monotonous, routine, repetitive and boring experience.
If we consider that both the partners must have equal involvement and pleasure from the sexual act, ‘man on top’ may deprive a woman from her active and assertive participation.
She may also dislike this position because of feeling of being literally pinned downed and overpowered. This situation arises when man is unable to express love and intimacy and hurries through the act without involving her in the act. Plus, in no other position woman feels so helpless.
These are probably the reasons why most women don’t like or enjoy sex and refuse the requests for sex without actually meaning to hurt their husband.
Intercourse is also most painful in this position if she has insufficient arousal causing lack of lubrication inside vagina and less of lengthening of vaginal canal and the man hurries for the intercourse.
The deeper insertion of penis into the vagina in this position, also does not necessarily give any pleasure to woman because the innermost part of the vagina is less responsive to sexual stimulation. It is the outer third of the vagina which is enriched with sensitive nerve endings which give her pleasure from sexual intercourse.
Woman may have very little control of the direction of insertion of the penis and practically no control over the thrust of penis.
There is very little contact over clitoris and if he has to hold weight of his body with his hands, he is not able to stimulate her body simultaneously.
Man in this most favourable position is likely to have quicker ejaculation. This could disappoint a woman if the sexual act finishes from his side, before she is even warmed up.
Woman who dislikes being surrendered or feels trapped by immobility finds this position stressful.
In situation where man is of heavier built, the thrust of penis could be unbearable unless partner takes good care.
Woman with smaller breasts feel vulnerable due to exposure to critical inspection. However, this issue will get resolved when woman actively participates in foreplay and makes even the small breasts responsive and pleasurable for the man.
Some women feel embarrassing to lie naked with legs apart in front of a man with whom they have barely developed intimacy. Such situations are overcome by covering the naked body under the sheet only to be revealed in dim light and by diverting her focus from sexual act to love making by extending the foreplay.