They are in the Evolution Body Morphs and can be found at Actor > Upper Torso > Universal > Nipples
Actually, I’m not seeing Genesis’s nipples anywhere in the Shaping tab. I’m using DS4P RC3, mostly with V4 and M4, but I just bought the new “Addison” character and wanted to try her out. When I noticed that she didn’t have any nipples, I went looking for the missing morphs, and all of the nipple and areola morphs (except for “nipple diameter”) appear to be missing. I thought maybe some of my Genesis morphs might have gotten goofed up in the RC3 install, so I reinstalled all of my Genesis morphs, but that didn’t bring them back.
*** A few minutes later ***
O.K., found the missing morphs buried deep in the Parameters tab. They’re still there, and they still work—they’re just not available in the Shaping tab in DS4P 4.5 RC3 for some reason.