I believe it was Rick Reilly (But I may be wrong) who penned a great satirical column once about these ads recounting fictitious conversations between a father and son, and included many questions like "Dad, what's Levitra do? Does it make you be able to throw a football through a hanging tire?"
The two bathtub thing gets me every time, though...I hope by the time I have children of age to watch golf tournaments with me that I don't have to explain what Priapism is...
I fear, however, that I may have to explain things much, much worse.