Hi, Sissy steve,
We abide by what Google dictates due to the business side of things. It does only apply to 'female' nipples. Or in other words, people with a vulva.
There is more on this here: Why no nipples
I have found that some people that identify as a male will also cover nipples in solidarity, I think that is awesome. In an ideal world, no nipple world be covered, but it is what it is... For now.