If you carry your
cell phone 
in your pocket, you might want to move it! Why, you may ask.
Experiments and tests by Time Ferriss author of the
The 4 Hour Body
actully showed that prolonged contact with a man's testicles were affecting sperm count negatively and how! Tim did some experiments and decided to change the location of his cell phone to a back pocket.
Why not
find out more about what happened when he did that! You will be surprised.
Mobile Phone Health