Since antiquity humans have understood that typically masculine behavior depends on testicles, the main source of testosterone in males. Which sex has the highest rates of physical violence, hunger for status, and desire for a high number of sex partners? Just follow the testosterone. Research on creatures from chimpanzees to spiny lizards shows how high testosterone helps males out-reproduce their competitors. Hooven shows that testosterone works...

"Feel great and perform at your best in the boardroom, weight room, bedroom, and beyond with this indispensable health and wellness guide: Your New Prime debunks current thinking about men's health and shows how every man can continue to operate at his peak at any age.Getting older may be inevitable, but in Your New Prime, serial entrepreneur and men's health expert Craig Cooper shows men that they don't have to accept the "natural" aging process....