Alex Of Earth, Human Sex (Extinction)

Humans went out on a ball of nuclear fire. It's not known galactically how long ago it was, only that by the time explorers found the irradiated mudball that Earth had become, the only signs humans had ever been were a few scattered monuments and a space capsule containing their vital information, such as the entirety of their genome.

Entrepeneuring scuttlers managed to sell this information to the highest bidder, who made a killing reviving the fallen race for use as slaves. Seeing as most of the galaxy had penetrative sex organs, human anatomy was rather compatible in a purely geometric sense. This fact, in tandem with the fact that humans have no natural weapons and tire very slowly, due to their ancestral role as persistence pursuit predators, lead to them becoming the premier sex slaves of the galaxy.

Legally, no human since their extinction has truly been anything but property, and galactic culture places a heavy emphasis on the fact that they were revived from extinction as the main reason why they do not deserve to be anything more.