First of all are you on any meds that could be interfering? A lot of psych meds have this effect, including the ones I am on.
Secondly can you think outside the box for other things you could try? For instance my husband and I are into bdsm. We have a whole box of restraints and toys. I'm also a masochist and get off on pain. Not saying this is right for you, merely suggesting creativity.
Also can you get yourself off?