It will be confusing when posters will say different things in the same thread. For example i disagree with the post by Bushmaster - because the loss of desire leads to the inability.
As you should know, loss of libido and ED are separate issues but closely related. For this reason, it varies for different people with some guys losing the desire but still getting hard, some not getting AS hard and some not getting either.
Nandrolone is supposed to raise prolactin higher than regular aromatising steroids - prolactin reduces libido.
Of course for many, this loss of libido leads to a loss of ability (even though IF you felt in the mood you may get it up, you never feel in the mood so don't).
Deca Dick is simply the sexual dysfunction caused by the use of a progestin (a synthetic hormone that acts like progesterone). It is most likely hormonally related to the lack of DHT and the increase in Prolactin.
This is why someone who doesn't use AAS cannot suffer from Deca Dick. Can they have the same issue through different means? Of course - but it aint 'deca' dick is it? (It would be Prozac and Proscar-dick..)
Viagra is for increasing erectile frequency and strength WHEN you are aroused. It won't work for someone with no desire.
It is for filling up those chambers with blood - it doesn't make you want sex if you didn't in the first place (once you have a raging hard-on, it is common to want sex more but this is different from what i mean).
I don't know if you have ever used it when it is not possible to be aroused - but it doesn't work.
Shit - even if it did then i for one would not be fucking women with a dick i am not emotionally 'connected' to. Be like being a big fleshy dildo...