Heh, wow, it seems that my one comment has given some new life to this thread, well, anyway, I believe I have found the source of all MPREG, in the most unlikely of suspects...yup, you guessed it, Bill Cosby. How can this be!?! you ask? Well, in the seventies and eighties (and maybe the nineties, I forget) ol' Bill ran a show called 'The Cosby Show' and in one episode his wife makes some remark to him about how men are lucky they never have to go through pregnancy, Bill then proceeds to take a nap and have a nightmare about a world where him and all the other adult male main!chars of the show are somehow pregnant, and having to deal with it, it takes it right up to the scene in the delivery room where Bill gives birth to an extremely long sub sandwhich and a miniature toy sailboat, for whatever reason, at which he wakes up. This is the earliest suggestion of MPREG that I've come across, thus I believe it to be The Source!