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Anal sex is the supreme act of sex, it is the fulfillment of the power dynamic between men and women in its more basic form. The woman's body pleasures the man while she his body does not pleasure her; it is the ultimate act of submission and dominance. The act finishes when the man is finished, and the woman has no say in the matter unless he allows her to. The woman receives nothing from the act and there can be no repercussions for the man as a result of doing it. The man is in full control at all times while performing anal, as all the woman's body can do is lie there and deal with the discomfort while waiting for him to finish.
Conversely vaginal sex is the ultimate humiliation for a man, as the woman's body assumes a level of control over him. The woman's body tries every underhanded tactic it's been equipped with to try and control the man, to try steal his vital essence from him so that the woman can entrap and tie the man to her forever. The woman's vagina is the most insidious thing evolution has come up with, because it's so poorly designed to please the woman that she will inevitably blame her partner for her failure to achieve orgasm. This just gives her another kind of control over him, a fake way to humiliate him and to entice him to try again, urging him to surrender himself to her whims.
There is literally nothing more emasculating to a man than to have vaginal intercourse, except perhaps for the act of cunnilingus, but that is a topic for another time.