It seems you are looking for an academic paper or research study specifically about the “Mod The Sims - Genitals mod.” After conducting a thorough search of academic databases (such as Google Scholar, JSTOR, and PubMed), no peer-reviewed paper dedicated solely to that specific mod appears to exist.
The administrators of Mod The Sims have stated that they will continue to host the mod, as it does not violate their explicit content policy. However, they have also emphasized that users must be aware of the mod's content and that it is not suitable for all audiences. Mod The Sims - Genitals mod-
For everyone else: The smooth, featureless, Barbie-and-Ken body is not a bug. It is a feature. And it is the reason The Sims remains on your family’s PC instead of locked behind an adult ID verification wall. It seems you are looking for an academic