Adwords currently bans ads for the following products.

products for passing drug tests
alcohol
ads which promote violence or discrimination
automated ad clicking
bulk marketing (i.e. email spam)
certain drugs and drug paraphernalia
counterfeit designer goods
data entry affiliate programs
dialers
fake documents
fireworks
gambling
hacking & cracking sites
miracle cures
proper names
prostitution
radar jammers
scams
sex
some forms of fund raising
tobacco
weapons

You can now add essay writing to the list. Its estimated that up to 12,000 essays are being sold to students every year. Which the vast majority of university consider cheating. Google has now taken steps to bad this type of service from appearing in Adwords.

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Domainmonster.com Customer Support Team.
Domain Names Information & Resources.