Samllville: How did Lex Luthor Empregnate Lana Lang?

Well I know how.... SOMEWHAT!!!! But she was not really pregnant. I get that they had sex but what exactly did he do to her because it was not a baby in her, it was some creature right? I just can't figure this out on how he did it unless he is so evil that his sperm could cause something that hideous. Please tell me if I am missing something here. And I also hope that PrimoPiccolo lends us his brain on this one cause he seams to the the fore most expert on Smallville here on RangerBoard.

Thanks everyone, look forward to reading your comments (You got it emoticon which apparently indicates a thumbs up with the icon)