Is science fiction as a genre, really just about humanity's desire to have crazy hot alien sex?

If there’s only two things in life people crave, it’s sex and variety.
So it’s no surprise that people love to hump things that are different than they are.

The English colonists loved the native Indian women in the 18th century, Thomas Jefferson obviously liked variety in his sex life, though forcing enslaved women into bed was kind of a dick move. The internet porn sites are full of women labeled as “exotic” and people can’t get enough, or so I’ve heard.

Not surprisingly this theme has always been big in entertainment. People crave the exotic and what’s more exotic than aliens?

Captain Kirk didn’t hesitate to get down with a green woman. If you’re into the Star Wars movies, they’re all about the hot alien women even if they have two long tentacles hanging from the back of their bald heads. Even in Galaxy Quest, the obscure Touchstone film with Tim Allen and Sigourney Weaver in a push up bra, Tony Shaloub’s character was romping with an alien octopus woman and that really seemed to turn him on. Sorry for putting the image of Monk having sex into your psyche but it’s moving towards a point

Of course it’d be incredibly negligent not to mention to Na’Vi of Avatar and despite being ten feet tall, they’re dripping with lithe feline kink. It’s like the whole planet is a sparkly fettish club with a distinctly azure theme and there’s enough cosplayers in the world who started painting themselves blue in December to suggest that more than a few people want some of what Neytiri’s got going on.

So when humanity encounters an alien race, would you hit it?