For the LL community, the first true skins with anatomical correctness that I am aware of. Simply extract the .zip file, and put the .package file into your Sims 4 mod folder. Any time they are naked the bits will show. These are textures only, they do not remove the censor mosaic. See below for a link to that mod.
Required / Recommended Mods:
If you want to see the details when they are bathing, you need a mod to remove the censor mosaic. There are several of them out there. I