I would venture to guess that if it were men who were biologically predisposed to do the fetus-gestating for 9 months and worry about the pain of childbirth and the bodily changes that occur during and after pregnancy, the ones surveyed would feel a little less enthusiasm than they currently do. Perhaps, if this were the case, the women surveyed might find themselves a little more excited. But ultimately, given good ol' biology and the fear of parenting inequities, this really isn't terribly surprising.
