Male Baldness Info

I once read an article which said that most men lose their hair as a result of increased testosterone levels in their body. Since testosterone increases the sex drive, it was said that the two factors are related. Is this always the case? What about for those men whose hair loss is genetic? Is the increase in libido significant? Does it decrease with time? Since increased testosterone also makes people more aggressive, does that mean that bold men are more aggressive than their counterparts?