I don't know how much is real, but maybe diet and exercise can have more of an effect than most of us know.
T-Nation.com | 5 Ways to Boost Testosterone
Pavel says to eat steak, too.
Seriously, I don't know your eating style, but lean meat and veggies are fruit sound good in principal, but they aren't the best for your hormones. Whole eggs, animal fat, cream, butter, etc. Saturated fat might help. Fat definitely helps.
T-Nation.com | Saturated Fat: Killer or Testosterone Booster?