Testosterone, and other heavy androgens, can most certainly affect BEHAVIOR.
I had an experience while using Andriol(Non-methylated Oral Testosterone) that I will never forget. I was using very high dosages of this stuff due to the poor bioavailbility, and was also injecting around 500mg of Testosterone per week. I became a MANIAC--in the true MEDICAL sense of the word. PURE MANIA. Meaning, my mood was so elevated and I was so overfilled with JOY, that I was actually becoming DELUSIONAL. YES, DELUSIONAL. BEYOND CONFIDENT, obsessed with fantasies of boundless beauty, success, or even fame. I was convinced I was a superior form of human being...
Every now and again, when my Testosterone level rises TOO high, I become a nutjob lol. Extremely agressive, eaily aroused(sexually and emotionally) and excessively verbal. I literally can't stop talking about myself. I suggest that everyone monitors their own thoughts and behavior, always seeking the opinions of those closest to you. It is hard to be OBJECTIVE when you are delusional...