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Researchers studying 22 male chimps in Uganda's Kibale National Park found that males with more testosterone also had more parasites living in their stomachs, ScienceNow reports.
Male chimps compete aggressively for dominance, like most primates, and testosterone aids in this aggression. After collecting fecal samples from the chimps in Uganda, researchers found, predictably, that the higher-ranking males had more testosterone, but that they also had apparently suppressed immune systems that allowed parasites greater reign. Their findings suggest that testosterone may play a role in the weakened immune systems.
Looks like we guys at Outside may want to tame our manliness a bit, if it can be done. But I doubt it. Immune systems are for sissies.