LOL - let me help you a bit since you didn't carefully read the source.
You can go further and check out tons of other articles to discuss the link between DHT, nitric oxide, and cGMP:
I won't go on further.. but please don't expect me to do your homework for you again.
"An erection occurs, when under the influence of sexually arousing stimuli the penis becomes engorged with blood. An erection is a very complex biological phenomenon but it involves 2 chemicals that we can focus on that play a major role in both male and female sexual arousal. These are nitric oxide (NO) and cyclic guanosine monophosphate (cGMP). Both of these result in relaxation of smooth muscle that controls blood vessels within the penis. This results in increased blood flow within the penis and both of these chemicals are positively influenced by testosterone. That is, without sufficient testosterone, there will not be enough NO and cGMP to create an erection. It turns out that DHT (dihydrotestosterone) is the principle regulator of these chemicals and DHT is manufactured in the body from testosterone."
Remarkably, basal NO level was enhanced threefold by stimulating dermal papilla cells with 5alpha-dihydrotestosterone (DHT) but not with testosterone.
I won't go on further.. but please don't expect me to do your homework for you again.
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