But you don't know why he has ED. Given what op said earlier about his upbringing he might have been conditioned from very early on that sex is something dirty. He may well have a huge psychological barrier about sex, hence why he will only ever consider the missionary position. It's not him being selfish.
If he wants intercourse before op is ready then she needs to tell him, particularly if it's painful for her.
As regards the medication, maybe they can't afford for him to take it every day. It's expensive if you have to buy it.
On every other thread where it's the woman who is unable, or doesn't want sex, posters state that having sex is not a right and that if the woman doesn't want sex then her partner just has to put up with it. Usually accompanied by a load of disparaging remarks about him too.
The poster will say that they are scared to show any affection for fear that the partner will assume sex will follow, which is maybe what's going on here, which is why the DH is withdrawn emotionally. Again, the woman will be sympathised with.
I have never seen a thread where the woman is told that if for any reason she doesn't want to, or cant, have sex, that she should just concentrate on her partner yet that's what's being said here.
The DH here is under no obligation to have sex with the op, particularly if he finds it too difficult. He doesn't have to take medication just for ops benefit, just as women don't have to take the pill or hrt to make sex possible for their partner.
The op here says that she has list her desire for sex and is blaming her DH for that. How come? How is he responsible for her loss of sex drive? Maybe that was always going to happen regardless of who her partner was.
I.do not understand why the same rules don't apply to men who do not want or are unable to have sex as they do for women. No one has to have sex if they don't want to. No one has to take medication in order to have sex if they don't want to. No one has the right to pressure a partner into doing anything that they don't want to do. These rules apply to both men and women. Imagine if the DH in this case took Viagra and then op still doesn't feel like sex - would you be telling her to crack on and "help him out"? No you wouldn't.