I know this will sound incredibly simplistic and very "blanket" response... but
its not all about the sex. you'll find that ina ny relationship, sex is the icing on the cake... but the cake is still delicious to eat without icing... and speaking of "eating" yes ther are other ways to have sex (well, maybe not according the Mr Clinton's definition of sex) via pleasuring with the tongue or fingers. there are lotsa ways to enjoy sex without intercourse or without orgasms too! ;-)
on a side note tho, it will bring up insecurities in not only you but possibly in any poly partners you have too... they may not understand that it is not that you arent aroused, merely that you have ED.
"...Love itself is what is left over when being in love has burned away, and this is both an art and a fortunate accident." ~St Augustine