How about this for a storyline:
George buys a pornographic video called "Cum and Play" thinking that it is a children's video about exercise (like Barney) to show to his new girlfriend's kid. Jerry buys a new video recorder to play the tape and finds out that the woman he is dating is in fact the star of the video. Kramer begins a publication of a new magazine called "Cosmo" (what else?) and advertises the video in the magazine that it is suitable for young children. Elaine tells Jerry he is dating the chairperson of the Morals Commitee of New York and that the woman is protesting against pornography especially "Cum and Play".
If you have any feedback or additions, just e-mail me.