You MUST have the June 2016 patch to use this set of mods! If you play in offline mode you'll have to go online and update - otherwise use the old Sims 4 Penis, Sims 4 Nipple mod, and Sims 4 Nude in CAS mods.
This mod optionally will give your Sims 4 male sims teen through elder their missing equipment, and give females 3D nipples. (Nipple shape ONLY.) Optionally it will show the nude body when you remove clothes in CAS and show the nude female top and the nude female and male bottoms as wearable clothing in CAS.