"So testosterone does subtle things to behavior. Nonetheless, this doesn't tell us much because everything can be interpreted every which way. Testosterone increases anxiety--you feel threatened and become more reactively aggressive. Testosterone decreases anxiety--you feel cocky and overconfident, become more preemptively aggressive. Testosterone increases risk taking--"Hey, let's gamble and invade." Testosterone increases risk taking--"Hey, let's gamble and make a peace offer." Testosterone makes you feel good--"Let's start another fight, since the last one went swell." Testosterone makes you feel good--"Let's all hold hands." It's a crucial unifying concept that testosterone's effects are hugely context dependent."