The cyclical nature of his punishment reminded the authors of the circular copulatory tube of the spider.[2] There is a 2nd meaning in this naming, however; female Sisyphus' copulatory tubes evolved in this way due to a reproductive arms race between the male and female members of the species, the females growing longer and more winding tubes while the males grow longer and more winding corresponding appendages, an eternal task, akin to that of Sisyphus

you'd think evolutionary forces would drive development of sex parts to make sex easier not harder