re: #35 Belafon
After watching Doctor Who and Torchwood, I assume every being from outside earth is open with their sexual preferences.
Science fiction is one of the ways we project our current mores and cultural obsessions on our view of the (near) future. In the 50’s, it was alien overlords wanting to come eat (or wash) our brains: i.e. the Red Menace from Space.
And the big thing that made Star Trek was its view of a future of humanity where race, gender and nationality were irrelevant: we all managed to maintain and express our individuality while working towards a common higher goal.