When Animals get sick they should be resting, but some of them will sacrifice that R&R for a little romp in the sack.
Human beings aren't the only living things on earth that will go to weird extremes for sex. In fact, an ailing animal will feign being healthy to mate. According to a study from the University of Zurich, animals do eat less, and rest more when they are sick. However, if given the chance to mate, animals will pretend as if they are completely healthy in order to attract the opposite sex. So, while you are out there deciding which illness to fake to your boss, these animals are trying to look as fit and healthy as possible in spite of their debilitating illnesses.