Like - trying to catch a disease on purpose.
From my point of view, it can only be "a masochist's dream" or "a masochist's delight".
Anyone who wishes for something bad for himself (like catching a disease) can only be a masochist, at least from everybody else's point of view.
- masochist (noun) someone who derives pleasure, from being humiliated or mistreated, either by another or by oneself. Someone who has a tendency to subject himself to unpleasant or trying experiences. TFD