By Julia Seidl October 25, According to a study by the Hebrew University of Jerusalem, sperm counts among Western men have dropped more than 50 percent in the past 40 years. That means the effects of poor lifestyle choices can be reversed in just two or three months. Here are some of the most common behaviours responsible for lowering his sperm count and what to do about them. In fact, frequent sexual activity is important for sperm health. Research has shown that moderate caffeine consumption has no negative influence on sperm count or quality, but reasonable consumption is milligrams, or only about two cups of coffee, says Caitlin Dunne, a fertility doctor at the Pacific Centre for Reproductive Medicine in Vancouver.