The older a man gets the less sexual drive he has. The bad news is that, apart from a drop in sexual desire men also experience an anatomical change. A reduction in penis size! According to a number of studies on matters of sexual life published in journals, to percentage of sexually active men between the ages of 40 and 70 falls from 60 percent to 30 percent. Regarding penis size, research indicates it also shrinks in size. mainly due to weight gain and the storing of fat under the belly and around the member (Aphrodite’s valley). This fat gradually buries the penis when it is flaccid. Do not despair, as exercise helps!