suggestion talk to your therapist again she might have mis understood something or you might have misunderstood something because there are a lot of people with full blown DID who do not have opposite sex alters. and there is no diagnostic criteria that says you have to have oposite sexed alters.

the following is the diagnostic criteria in the USA for having DID I found it on http://www.behavenet.com/capsules/disorders/did.htm

Diagnostic criteria for 300.14 Dissociative Identity Disorder
(cautionary statement)

A. The presence of two or more distinct identities or personality states (each with its own relatively enduring pattern of perceiving, relating to, and thinking about the environment and self).

B. At least two of these identities or personality states recurrently take control of the person's behavior.

C. Inability to recall important personal information that is too extensive to be explained by ordinary forgetfulness.

D. The disturbance is not due to the direct physiological effects of a substance (e.g., blackouts or chaotic behavior during Alcohol Intoxication) or a general medical condition (e.g., complex partial seizures). Note: In children, the symptoms are not attributable to imaginary playmates or other fantasy play.

Reprinted with permission from the Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition, Text Revision. Copyright 2000 American Psychiatric Association