I want to have my aliens have a culture that clashes with human modern culture and one way I want to achieve this is having some extreme sexual dimorphism.
For these aliens the sexual dimorphism is such that the males are the hosts and the females are the parasites. It's alot like reverse angler fish dimorphism and this is how it works: the females are basically really small tubes with arms and attach themselves to the males' gonads; when the female does it also her immune system and everything else combines with the male's body and they become one. The females know only one thing and that is to attach to the best male and reproduce as fast as possible.
The females outnumber the males 100 to 1. There are three gonads on the male and once they are all taken the females just attach to the previous female forming long chains that look like tails.
As for gestation and birth well gestation occurs in the male once the female has been fertilized and sends the eggs to an organ to store them and then after a 80 day period the one male has a live birth and is sent through a canal through the chain of females and then after that one hundred females are born in tiny eggs. And yes the next up in line females can fertilized when a canal grows up through all of them and send the fertilization material and retrieves and births the eggs. The fertilization and birth cycles only happen once a decade as well
My question is: what kind of environment would this system work best in and what are the benefits to it?