The article in question is a description of a bit of sexual jargon or folklore; the kind of stuff you get on Howard Stern. As it seems to me that it falls within the remit of the deletion policy (http://en.wikipedia.org/wiki/Wikipedia:What_Wikipedia_is_not#Wikipedia_is_no...) I listed it. http://en.wikipedia.org/wiki/Wikipedia:Votes_for_deletion/Donkey_punch
Although the article has only been listed for only two days, so far there is a 2:1 majority vote for keep. In my opinion this kind of article would render Wikipedia difficult to describe as "safe for classroom use"; also teachers recommending it to younger children for homework research would be put at risk of censure because of articles like this. Whatever those who voted think Wikipedia is, a classroom-safe reference work is clearly not number one on the list. This doesn't render Wikipedia content forever inaccessible to classrooms, however. This and other articles of its type are in the category "Sex moves". These could be filtered out easily during production of a classroom-safe copy of Wikipedia.