Yes, if we are getting backlinks from adult sites, then it is harmful for ranking. Even Google may penalize your site if it has gained backlink from adult sites. But your site itself is adult, and then getting backlink from adult site which is having good authority is different matter. But in general, getting backlinks from adult sites are not good at all in Google prospective.
They aren't bad. Google loves porn.
It is not bad but why more people wanted to push many links of competitors' sites into adult sites to decrease SEO rankings.No, in fact if that adult site has high PR then the backlink is still a good quality link
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