Such is the internet. In its raw uncensored format it can be informative, funny, sad, gross, disgusting, erotic and probably dozens more emotions I cant think of right at the moment. Sure Coke screwed up, and the ad company are obviously idiots to even think of associating with with a food brand, but seriously when are parents going to realise that if a child has access to the internet, at some stage they are going to be exposed to something of an unpleasant nature.
2 girls 1 cup, while pretty disgusting, is only on the inner edge of gross when it comes to the net, so the parents need to be aware that they are probably lucky that the weird and misguided intentions of the ad agency didn't dig deeper into the hideous, sickening bowels of what can be found on the internet.