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Yes, the Australian marsupial mouse, a small rodent about four inches long. His life changes radically when he reaches “adolescence”: his testicles enlarge and reach almost a quarter of his total weight! The production of sperm and testosterone, the male sex hormone, goes through the roof. Crazy to mate, he goes in search of one (or several) partner(s) and is capable of having sex for 12 hours straight! But too much testosterone in your bloodstream affects your immune system, leaving you prone to infections. Studies reveal that most die about ten days after mating, which occurs in July or August. But, as the darn thing had sex until he couldn’t anymore and fertilized several females before he kicked the bucket, he ensured the survival of the species.