For a man that is unable to have an erection (and ergo unable to have relations) must they follow the laws of shomer negiah (lo tikr'vu "don't draw near to nakedness"), or is the "drawing near" to reveal nakedness primarily only in situations where it can lead to actual relations? Does it matter if the halacha is like the Rambam or Ramban (d'oraissa or d'rabannan respectively)?
(This is a follow up to the question: Yichud with someone who can't have an erection)