The biggest cause of infertility in men is abnormal sperm. Sperm can be affected by lifestyle factors such as smoking, drinking, alcohol and taking drugs. The good news is, once you become aware of them, they are fairly easy to avoid. Is it true that the temperature of testicles affects fertility? The testicles are outside your body for a reason. They are happiest at 34.5 degrees C, which is just below normal body temperature. They need this cooler environment to produce the best-quality sperm. Working in a hot environment, such as a bakery or a foundry, or sitting for long periods...