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What are the benefits and disadvantages of adding a few hobby pages unrelated to website design to your site, particularly when people start linking to them?
If I run a widget site and put up some hot pron pages that get a ton of links, and the SE's take note, most likely I'd either get banned, penalized or at least lose the inbound link equity from the pron sites.
The example stretches the point but the point is, if the content is unrelated to the site and a spam checker is having a look and judges your actions to be spammy, it may well come down to the personality, individual biases, experience and even the mood of that individual as to what happens next.
Are you willing to risk that?
I've seen such arbitrary and uneven application of penalties and bans to sites that all I can say for sure is: It's a crapshoot.
Eye of the beholder.
In this case the beholder of concern is the search engine spam checker. Arbitrariness is unavoidable no matter how many guides the SE's put out.
Pron is obvious, but where is the line, and who determines intent?
It is why the basic clichés exist about "build content for users." Follow that approach and it's a lot harder to go wrong. If you feel it's a stretch most likely others will too and that is where risk starts to build.