'it's official: too much sex saps male brains'

male animals can produce a lot of sperm or grow big brains but cannot do both, according to a study that may confirm the suspicions of many women.

the study of 334 bat species suggests that energy-hungry brains can evolve only at the expense of other tissues.

writing in proceedings of the royal society, biological sciences, scott pitnick, of syracuse university, new york, reported that species with promiscuous females had evolved extra large testicles but smaller brains.

smh article