When I was a youngster, one of the thoughts that haunted everyone I knew was the idea of our own parents having sex. But then we all had sex, and it probably freaked our parents out even worse. So maybe they all agreed to pretend there’s such a thing as a boner pill just so they could put ads on TV showing old people getting horny for each other so youngsters would think of their parents using such a thing and having sex and get grossed out?
I don’t have any proof of this conspiracy, but it seems like a real enough possibility to me. And shouldn’t your parents always get the last laugh anyway, after all they put up with? (I mean if they were good parents, of course.)