Okay Hamster, in hopes that my husband doesn't subscribe to this forum (doubtful), I will share my experiences with erectile disfunction. My husband occasionally had problems, so he got the little blue pill, as we call it. He can still perform without, but I actually prefer intimacy with the pill. It is an intensity issue with me, and while I could go into more, I won't.
If your friend has a prescription for ED, then you should have no worries. The physical part may even be better than you remember.
Bluemountains