A group of explorers travels into deep space and discovers a specie of alien that's constantly horny. It could either be beastiality-based, with creatures that are not humanoid for once in sci-fi history; or it could be humanoid but with sexualy benefit features.
For example, the males could have multiple sperm-producing sacs, their appendage would be constantly lubed and ready for penetration. For the females, they could have multiple fertile holes to get empregnant from. Of course, they would release pheromones all the time.
For example, the males could have multiple sperm-producing sacs, their appendage would be constantly lubed and ready for penetration. For the females, they could have multiple fertile holes to get empregnant from. Of course, they would release pheromones all the time.
