I also don't think it's a good idea to send your adult traffic to your mainstream sites but I disagree it will have a negative impact on search engines ranking.
I think it will have a negative impact ONLY it there's no relationship between the content of the sites (in this case the link could be considered something like a junk link). I don't think if you have a foot fetish site and you link to foot fetish book on Amazon you'll be deranked. Google is not that stupid. At most Amazon will close your acount as it is forbidden to advertise them on adult sites : )
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