The issues you raise aren’t only from your generation. I do hope yours is the last to have to struggle with it. I can assure Gen Z is extremely open about their sexuality. Too much so? Maybe. And I see it in my private therapy practice, so my awareness may be skewed. I like the term heteroflexible for myself. I have only been in love with one woman. I will write about that soon. Also, I’m not sure what you mean by passing. Femme lesbians “pass” without intending to as well. They are simply being themselves.