As you probably know, the sentences displayed here are from the Tatoeba project (link in the footer). I don't think Jisho.org currently does any filtering of them based on any criteria.
The Tatoeba project itself has some rules on sentences, but I don't think they're forbidding sentences like the one you quoted. See: http://en.wiki.tatoeba.org/articles/show/guidelines#do-not-submit-sentences-that-will-antagonize-contr
Personally I don't take any issue with these sentences. Books don't have age restrictions, so I don't think example sentences on the internet need to have them, but I also understand that not everyone likes to see these sentences. Maybe the optimal way would be to flag sentences like these in the database and only show them in search results to logged-in users that opted into seeing them.
It would indeed be nice to have some sort of X-rated tags on sentences, like JMdict has. Since meta data isn't easily editable through Tatoeba I'm considering creating an out-of-band metadata file for Jisho's purpose that could include X-rating, furigana and whatever else comes up.
Appropriate?
Um... maybe this shouldn't be here. Especially as the first sentence returned for a search of 脱ぐ.