So this article "Top Ten Guys Women Fantasize about Cheating With" caught my eye.
Now, before you get all nervous about your lady fantasizing about your brother, you should know the original survey was done in Australia. Not that I know for a fact that American women would feel differently, I just haven't seen that survey.
Oh. And the women who participated in the study belong to an online dating site for married or attached people seeking "confidential" relationships.