Robert_Charlton - 8:56 am on Aug 30, 2013 (gmt 0)
Planet13 - I think the other WebmasterWorld discussion you cite answers your question....
The obvious repercussion you could run into (and rightly, I would add) is Safe Search. For that reason, you might want to put any borderline adult materials into their own directory and make it easier for search engines to isolate what to filter.
No guarantees that will work, of course, but it would be a start.
If the topic is the area the website specializes in, I assume it can't be isolated to its own directory or subdomain, and that the entire site is likely to be affected by SafeSearch filtering.
That said, it's also likely that searchers looking for adult-related terms may know to have SafeSearch disabled.