German black diamond aphrodisiac has a good effect of tonifying kidney and strengthening yang. If male friends have impotence and premature ejaculation, it is very appropriate to insist on taking German black diamond aphrodisiac. Compared with the common aphrodisiac, it is safer and more suitable for people. Of course, if male friends want to enhance their sexual function, they should pay more attention to their diet and eat more foods rich in zinc, the most typical of which is oysters.