London: Woo-hoo! Being a beefcake is a true blessing. Not only does your body becomes a "crowd stopper", you also end up attracting most women. But wait, there's a downside of all that brawn: poor immune system and an increased appetite. That's the conclusion of a new study. According to William Lassek, an evolutionary psychologist at the University of Pittsburgh, Pennsylvania, who led the new study, such evolutionary costs could explain why males of our species do not all look like He-Man. "In some respects I was surprised at how big the costs were... something I hadn't anticipated," New Scientist quoted him, as saying. Multifarious studies have concluded that ladies tend to prefer more toned men, and muscle-bound men tend to have more sexual partners than slender men. However, previous research has also suggested that musculature comes with a cost. Testosterone, a hormone that promotes secondary muscle growth, suppresses the immune system of all animals, including people.