The last two paragraphs of the article sums it up:
And DjBeeTee tweeted: "Let's add it up: Red=eroticism, sports car=substitute for potency, animal print mini-skirt=sex appeal, banana=phallic symbol. But sure this is all just accidental..."
However, Mark Kreuzer, an engineer and blogger, tweeted: "Hmm, well for me the message is: Audi RS4 = family car. Just as your own daughter makes your heart beat faster, so does the RS4. And both are of course cool."