Hi,
I'm coming up to my 4th post op anniversary, and like you, I had a positive margin. I had a good run of around 18 months until my PSA started rising.
I had salvage radiotherapy without HT last year. ED wise, I took a little hit at the time, but that could have been stress/anxiety.
Penetrative sex wise.. it's pretty good and I don't really have any problems now, although I still take my tadalafil prescription.
Maybe discuss your options, will SRT be with or without HT? Also, is that 0.37 figure right? are they going to retest etc..
Hope this helps.
Kev.