In my opinion, and I agree with kw, your friend should get another opinion. You didn't mention if your friend had tried the injections yet, because these can induce an erection, when the pills and the MUSE can't.
Shortly after my surgery, my wife and I were invited to a conference by my urologist's department, which kind of turned out to be a marketing presentation for surgical interventions for erectile dysfunction and incontinence. Nevertheless, it was a chance to hear some information and ask questions about the procedures. A doctor presented about the penile implant, and the one they talked about was that made by American Medical Systems (http://www.americanmedicalsystems.com/mens_health.html). The doctor said that there was a low rate of problems with it, and a local businessman who was the recipient of the implant, and his wife, gave a testimonial about their satisfaction with it. The decision to have one is kind of final, because they use the spaces of the natural erectile tissues to put the thing in. That website gives the names and locations of doctors who provide this intervention, and you might find somebody close to you. Chances are those doctors may have ideas, just short of doing the implantations, to help.
All the best. Keep us posted.
PSA (10/04): 2.9; PSA (2/06):4.4, on Androgel (serum T about 450) at age 56; negative DRE, no symptoms.
PSA (5/06):5.7 with a free PSA% of 8, OFF Androgel (serum T 163).
Biopsy (5/06): 4/12 samples positive; postitive samples only on right side; max Gleason 4+3=7 (in 2 of the 4 -from area nearest bladder.
DaVinci robotic-assisted laparoscopic radical prostatectomy + bladder lift + Right nerve plastic surgery (8/23/06).
Catheter out 4 weeks postop, due to internal pinhole leak at bladder-urethra junction.
Final pathology report:T2c-both sides,but in capsule; neg. margins, neg. lymph nodes, neg. seminal vesicles; final max Gleason still 4+3=7.
Follow-up PSA (11/06): <0.008; serum T: 195 OFF Androgel (at present).