In competitive situations, men are supposed to respond with an increase in testosterone, and this may have consequences on social perception. Here, we investigated whether short-term changes in testosterone can be experimentally induced by exposing men to a computer fighting game. Men’s testosterone levels after the task were higher than before the task. However, a similar effect was found for an exercising task, and in a control condition. Thus, the competitive context did not turn out to be particularly provocative in terms of producing a testosterone response. In addition, changes in testosterone did not predict face assessments of potential rivals and attractive women.