Hi Craig...
I am new to this board, but I'm the one with the Bi-Polar disorder and I agree with Lilya--people with Bi-Polor can be Hyper-sexual, Hypo-sexual, or Asexual. I mean, as a man, I cannot even begin to tell you that I've gone through periods that I wanted no sex with my wife, then I flipped and wanted sex constantly. I think that the disorder has to be properly medicated.
Seroquel is an atypical antipsychotic, which is used in treating people who have psychotic features. Bi-Polar Disorder can also have a psychotic component. Is she on any mood stabilizers like Depakote, Lithum, Tegretal, or Nuerontin? Like Lilya says, you'll can get much support here. These folks are really terrific
I wish you two the best and please seek out the assistance of a psychiatrist to help her with her medications. They can only work if she takes them.
K