Act 2 Scene 3

Does anyone remember the porter in act 2 scene 3?  Well my project is on that scene and I came across an idea that I thought was very important to one of the main themes in the whole play.  Macbeth struggled with "wearing the pants" in the relationship for the first half of the play (until he killed Duncan) because he was not mentally tough enough to control he and Lady Macbeth's marriage.  The porter talks to Macduff and Lennox about how alcohol stops one from being able to perform sexual tasks while Lady Macbeth kind of sexually taunts Macbeth, holding his "man card" over his head when he refuses to kill Duncan at first.  Alcohol does not make Macbeth refuse to killing Duncan, it is just his sober and straight thinking mind that deprives him of sex from his wife while he refuses to murder someone. I find it interesting that a drunk would subtly point out this detail while drawing attention to how he is no long speaking poetically when his lines come up.  Let me know what you think...