Personally, I'm not a fan of visible nipples on furries. I get why they might be wanted here simply because it's an extra spot that people could interact with who are interested, but having the option to remove them from custom characters would be awesome.
In my opinion, nipples should hardly be visible if at all simply because they are covered in fur. But that's just me being picky. Currently I try to mask them with same color as the fur around them.
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