The first one you really didn't read, did you? "In contrast to received wisdom regarding testosterone and risk, the present data provide the first robust evidence for a nonlinear association between economic preferences and levels of endogenous testosterone."
"Despite the common view that high testosterone levels lead to risky decisions across numerous domains, we found that testosterone has a quadratic relationship with economic risk preferences: Individuals with low and high levels of testosterone (within their gender) were risk and ambiguity neutral, whereas individuals with intermediate levels of testosterone were risk and ambiguity averse."