This is a book of crucial importance to every male who is curious or concerned about the quality of manhood. And it is especially vital to all who want to understand about the size of their genitals, their ability to build muscles, bone, body hair, the tone of their voice, capacity to handle stress and fatigue, and ability to respond sexually. Throughout his life a man's 'manliness', physically and psychologically, is almost exclusively dictated by the quality of a magical substance in his body, the hormone called testosterone. Here is the first up-to-date book for the layman on this amazing male sex hormone. The reader learns about what testosterone does, but also how taking testosterone can be a safe therapy that enhances the middle-aged and older male's sex life. There is also useful advice on the steps any man can take to help his testicles to produce more testosterone through diet and other lifestyle changes. Also includes detailed information on testosterone's relationship to prostate cancer.