Aye and Gomorrah 1967

I read this short story for the reading this week. I didn't totally understand what was going on in the story but i tried my best to grasp it. this was a very confusing story. from what i read i got that the spacers were people who had no gender. the spacers gave off kind of a stuck up attitude like they were better then the rest of the people and the frelks who im assuming were more like humans didnt seem to like them but also at the same time they found them attractive. I got from this that the spacers were in a way like prostitutes and the frelks had to pay them for any type of activity. Im still confused as to whether the spacers dont have genders or if they are like some cultures today and just are born one gender but practice as another.