Hi Dave,
   You have discoverd the fact that many men find out after being
compromised....
Yes, orgasm, and sex can take place without erection.
The more you practice, you may be surprised that erectile funcion starts to
happen.
I bought a "Rejoyn Pump" yes a toy but it worked.....
I went to see the Dr....
I got injections....
They work......sometimes painful.
I tried Viagra......headache first time.
2 years later.......pump, injections, funny thing......I started to get
function.......yes.....
I used Viagra.....no headache, and yes......erectile function......
It takes time, trial, and a wife or mate that can handle the differing
aspects of recovery...
Do, keep trying, and have fun.
You will be ok.
I was 49 when I had to deal with this....
I am 54 now....
1/4 of a 100 mgs works wonders........(viagra)
John Loomis

I've read a few times in this forum about so called "dry orgasms" but
have also discovered (am I the only one to know this?) that an erection
is not necessary to have an orgasm.

The use of viagra et al seems to me to be purely to stimulate a
mechanical response, i.e. to promote blood flow to the penis, not a
"feeling" one.
=====================
hi dave - there are three responses that are all independent, but
overlap in normal function.  first, erection without orgasm or
ejaculation.  it is a stand alone response.
second, orgasm without erection or ejaculation.  they teach this in some
cultures - the lack of ejaculation and to be able to have multiple
orgasms.
third - ejaculation without erection or orgasm.  this can be done by
triggering the nerves in order to get a semen sample.  a friend had this
done by the doctor and in front of the nurse without warning him of what
was to happen.  

most males have the three responses meet and think that is the way it is
suppose to be.

in response to you taking viagra and the mechanical feeling.   if you do
some research on these pills, there are some men who have trouble
achieving orgasm because of taking viagra.  i haven't seen any
documentation on this from the company, but i have seen enough comments
from people writing about the effect it has on them.

~ curtis

knowledge is power - growing old is mandatory - growing wise is optional    
"Many more men die with prostate cancer than of it. Growing old is
invariably fatal. Prostate cancer is only sometimes so."

I too was stunned to find that erection and orgasm were not directly linked.
I suppose most 99% of us were when we first found out.  I imagine 50% of us
were stunned to find out even after having been told by our docs.

I think this depends on the man (and on his partner).   For some men,
having the erection helps achieve climax, but for others it is
irrelevant.  I tend towards the former, but I did achieve orgasms
earlier before my erections returned.  Also, for some men, the loss of
the prostate makes absolutely no difference in the nature of the orgasm
(except for it being dry) and for others it makes a difference.  I'm one
of the latter in that my orgasms are now usually a bit less intense, but
the whole experience is still well worth the effort.  (This was just an
exaggeration of what had already been happening with age anyway.) I just
concentrate more on what happens before the climax.  For some men, the
experience is actually better than it was before treatment.