there is no such thing as "nsfw model" on daz. You just pick any model you want and you attach anatomical elements to it. So every model can become an nsfw modle if you want. Daz is a character creator. You can pick and match things as you like. The genitals are a geograft. They get fused into the mesh automatically with a click, you don't need to do any mesh editing yourself. Just make sure that when you buy a model, it has a texture for anatomical elements listed in the product contents. Alternatively, if you go with golden palace, the textures are generated automatically.