Post-Separation Lesbians is something which can happen to Narcissists who get rejected / abandoned usually by another, but different kind of Narcissist. For example the Cerebral male Narc unceremoniously dumps his lover, a Somatic female Narc. The Somatic female suffers Narcissistic Injury. She then looks for a woman to become her Lover and new Source of Narcissistic Supply.
The article “Post-Divorce Lesbians” posted on the First Wives World website addresses the switch to finding a Lesbian Lover, after a divorce or separation from a male ex.