Dear Frustrated,
I remember when I was in a similar position as you and complained, "When I get love there's no sex, and when I get sex there's no love." Eventually I managed to get the two together but I must say it wasn't easy. Then later on I had to separate sex from love to further my understanding of human sexuality.
Seems like one of the ED drugs would be a good solution for your man. Many men tell me they have had good results with them. He'll have to check with a doc and maybe try one or more of the available ones. Getting him to change his diet and begin to exercise is another thing that would help immensely. As for you question about other ways to enjoy sex, by all means read my book "Orgasms for Two." Sharing more orgasms together that don't require his hardon would definitely take some pressure off of his poor beleaguered dick. But as you said, if nothing helps your present situation with him, don't sign up for a lifetime of it.
Betty