"Some Female Fish Evolve Bigger Brains as Males Evolve Larger Genitals"
The truth really is stranger than fiction, but this explains a LOT about the world we live in.
More from the story: STOCKHOLM, Sweden, Nov. 23 (UPI) -- New research suggests sexual conflict among fish can encourage both bigger brains and larger genitals. In lab tests involving eastern mosquitofish, scientists found males with larger genitals triggered the development of bigger female brains. Previous fish studies have shown the antagonistic relationship among predators and their prey inspires the evolution of larger brains. More recently, scientists wanted to find out if the hostile nature of female-male relationship might yield similar results.
No word on whether the males' brains got smaller, but I suspect that might be the case.