Getting married saps your testosterone 18 October 2007 NewScientist.com news service TESTOSTERONE gradually declines with age, right? Not for the Ariaal - subsistence pastoralists living in northern Kenya. They experience a decline in levels of the male hormone only when they get married. The finding provides a social and evolutionary explanation for the decrease in testosterone, rather than an age-related one. Ariaal men remain single "warriors" until they are around 30, at which time they marry one or more women. Peter Gray of the University of Nevada, Las Vegas, and colleagues measured testosterone in 205 Ariaal men and found that...