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there a full cg unlock floating aroudn the thread, but no real cheat.
save editors of cheatengine may work to cheat money or amount of semen (even default stats), but considering the kind of game, usually grinding semen to boost your stats or simply grinding level are enough to roll on all the game content.
All the "bad end" with each girl pregnancy are related to the raunch skill. I remember seeing somewhere a kind of walkthrough for each ending at the time of the JP release, but it was so long ago I can't remember where it was... I can try searching a bit, but I wouldn't get my hope up.