就像是陰莖入口的大門打開了，血液開始流進海綿體而造成勃起。威而鋼並不會直接造成海綿體平滑肌放鬆，而是藉由抑制PDE5來促進一氧化氮的作用。
David Ball Management is a personal management agency in London.. The brief was to design a contemporary WordPress theme using thier brand colours with a sleek interface.
