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Making a mesh is entirely different from making a skin. The mesh is the 3D shape of the sim's body and clothing, while a skin is the image of skin texture and details like shadowing and a belly button, etc. that is 'painted' on it. To get a penis that's not just painted on you have to make a mesh. I suggest any basic Sims 3 meshing tutorial to start with. For a penis the best strategy is to mesh the part separately, UV map it to one of the standard penis texture locations on existing adult skins, add it to the nude male bottom mesh (regrouping it as one mesh), and package it as a default replacement mesh.
Please do not PM me with mod, tutorial, or general modding questions or problems; post them in the thread for the mod or tutorial or post them in the appropriate forum.
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