>>150731515
They aren't "sex slave aliens". It's a shitty retcon that came from the comics after the fact for no reason whatsoever, because that one twi'lek in the movie was a slave, therefore all twi'leks must be slaves. Just like Boba Fett was a bounty hunter, therefore all mandalorians must be boba fett bounty hunters. Just like Han Solo is a lucky pilot, therefore all Corellians are lucky pilots. And so on. This was just the EU for you. Even though there were other species presented as slaves as well, but for some reason it's the twi'leks that became "token slave race". It was never really canon, and isn't good for anything but utterly depraved porn fics. As for fertility, we know they can breed with humans.