Why are so many random sims shaped like a pear?

@Simpkin I downloaded from another page which is no longer accessible, but it looks like this is the same thing, posted June 2018. My download from over a year ago still works after all the recent updates, so this should be good:

https://zerbu.tumblr.com/post/175487446125/what-happened-to-the-cas-presets-mod