I've heard a lot of people say this, and yet I say that they're wrong. Cartoons have always had sex in them. Just take a look at all those clips from Animaniacs. There's tons of innuendo in that show,and same with other shows from that era seem to have a lot of sex in them too. I think that its just we're old enough to see the hidden jokes that are there.
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Like that Franklin & Friends scene where they put two stuffed animals on a train in a position that made it look like they were banging each other?