Interesting Point, for Those Who Care...
In regard to our previous academic discussions of Monks using open hand attacks against monsters with paralasis touch attacks, etc., I, for one, was relieved to find that this subject has, indeed, been dealt with in the DMG. Specifically, on page 293, under the heading Energy Drain and Negative Levels, in the third paragraph down it says, "Most energy drain attacks [and by extension paralysis attacks, et al.] require a successful melee attack roll -- mere physical contact is not enough. Monks, for instance, can pound such creatures with their fists without risking their life energy." [emphasis added.]