Hey Irish Guy,
Good question. There's is way too little discussion about sex after this kind of surgery.
My take on what othes have said (on this website and others) is that there is huge variation for return to potency. Pre-surgery potency is a significant predictor of potency after surgery (assuming no other issues like lasting nerve damage...).
Some docs suggest that pills and/or shots can help speed things along, though I dunno, haven't seen compelling data. The latest scuttlebut is to do whatever it takes to get blood flow into your penis as soon as possible.
For me, there was no potency for several months, then maybe at month 5 or so I tried the pills (Viagra gave no response and Ciallis, while it worked, kinda, gave me a terrible headache and backache - I've not used either since). At maybe month 8 or so I received one injection in the doctors office which worked for a couple of hours (didn't have an immediate opportunity to use my new found return to potency, unfortunately, as I went to the doctor's office all by my lonesome - though I might have imagined a couple of nurses glancing at my trousers as I left the doctor's office).
My one person's point-of-view is that the one shot might have helped 'jump started' my hydraulics.
Starting at about a year or so, potency returned, no pills or shots. I wasn't terribly diligent about getting blood flow 'down there', I'm doing fine, so read up on this stuff, maybe see an ED doc, and do what makes sense...
Here is an excellent website that while it focuses on prostate patients, has good info on sex issues, be they pills, shots (bi-mix, tri-mix), vacuum devices, rings, implants, emotional issues... Both men and women participate. You might find it useful to sign up for awhile, read the posts... I've learned some new lingo, like erections can be quantified as being 'stuffable' or not...
www.prostatepointers.org/mailman/listinfo/pcai
And definitely get your wife/gf... involved and talk about this stuff. And laugh. Then talk some more. Then keep talking and laughing.
There are LOTS of post-surgery options for sex, both for you and ur honey.