It's interesting how many marriages there are out there where we're living like roommates. Has anyone's spouse been dx. with Aspergers? Has anyone's spouse been sexually abused which is causing the sexual anorexia?
I've read that in some instances it could be. It is one possible reason. Abuse issues as well, but as often not. There are so many possible reasons: Low self esteem, depression, lack of motivation, health issues, personality disorders, anger, loss of attraction to partner, etc. Sometimes, they just don't care.
If the refuser doesn't care about their spouse or themself, there is nothing that can be done. The rejected spouse has to change cause they can't or won't.