I remember ages back before I signed up to mumnet reading what was basically a blog on the internet (although on a chat forum I think) about a woman who was pregnant, and it could be any one of three (I think) men.
Her boss, husband and someone else I can't remeber. It sounded very much like a fictional story they were trying out, but never read the end and would like to know now!
This may or may not have been mumsnet but I think it might have been....