Johan, that idea was very well defended in the book. That was its point - that "grero" is a slap in the face of all that people want to believe. "I'm gay" is individual; grero is global
In my experience, everyone is straight until the lights go out :-)
The games that go into having to figure out who us who in the zoo just complicate things. Wish more people not only knew their own sexual orientation but felt comfortable enough with it to work with it