back a few weeks ago i noticed the google keyword tool (which i stopped using long+ ago) added 'dildo' to the keywords list for a particular (neglected) ad group (section wasn't sex related). Had a small wtf? & laugh. Besides that though i've successfully advertised a (different) section about sex w/out issue, also a couple on different (+/-illegal) drugs. - I asked google about the sex one beforehand, they never had a problem with it.