You don’t dream with your testicles 
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In the same vein, women (those who were born with a womb) can still engage in womb dreaming even after a hysterectomy.
And if he had reached the seventh gate of dreaming, whatever you think that is since only the first four are spelled out in the books, shouldn’t he be able to answer that himself?!?
The seventh gate would naturally involve total facility with the energy body, and thus be up to one’s ears in seeing (silent knowledge).