Why do men have dirty nails?

Most women have clean or colored nails while most men have dirty nails like there are some shit particles inside it and it is disgusting to me. If i don't shave my nails and take a shower, i feel embarrassed.

Don't you girls hate it when a guy has dirty nails or is it natural for you?

Yes it is disgusting and a big turn off
It is natural/neutral for me in men
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Why do men have dirty nails?
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