Hi, new to the forum too but spotted your post and can relate to it.
I met my man (who has PD) 3 years ago and our road to finding a stable relationship hasn't been without it's challenges to be honest. However, erectile dysfunction is not a problem with my partner in fact, I would probably say that the hyper sexuality (a side effect of his medication) has been more of an issue.
We have a fantastic sex life but we have had to learn to deal with paranoia, jealousy and unusual sexual behaviour so we had to learn to talk and to trust and, we both had to learn to recognise and deal with new side effects as they pop up.
Suffice to say, we got married this year 
but living with PD is not something everyone would be able to deal with however, you will not know if you can unless you explore the possibilities.