pandabear, are you 100% you are just not into sex at all, or could there be a smidgen of a chance that though you really care for your partner, that they just don't spark the desire in you. Could there be anyone else out there that might spark that desire? Do you ever fantasize about anyone else, sexually or at least romantically? If you ever do, then maybe your partner is more a platonic type partner and not a romantic one. If there is real romantic attraction, very often sexual desire eventually comes with it, unless you have a real issue with sex. Either way, you may want to talk about this topic with a therapist. Don't be afraid to, if you haven't already. Therapists are used to talking about sex issues.

Psychiatrists could be people to talk about sex issues to, but they tend to concentrate on a slightly different aspect of the issue than many therapists might. I tend to feel that talking about sex issues is easier with a mental health professional of the same sex, and possibly of the approximate same age, but I guess that can vary by person and mental health professional.