Assuming you're talking about penile function in the sense of putting a flashlight in your pocket, my experience has been that shucking the DHT did not affect that ability. Testosterone will keep that going. However, adding an Estrogen substance will indeed change the equation. How much change will depend on how much Estrogen. While I have had shrinkage, and decreased sexual function over the last 2 years, my recent run-in with a couple of Testosterone shots has quite clearly demonstrated to me that that ability can be quickly recovered. Thus my belief that halting DHT production exclusively, should have "little effect" on the "little guy". As far as never having male pattern baldness, that may depend both on genetics, and how much DHT blockers you take to drive it into submission. Be aware, too, that if you ever drive your T level as low as I did, (20), that you probably will have very little, if any, DHT to block. Decision you'll have to make. You should consider monitoring blood chemistry levels if at all possible should you undertake these changes. Patti