I don't quite follow - you're saying it's easier for a woman to have a child than a man?

From a purely biological perspective this seems backwards to me. A desirable man could conceivably produce many children over the course of nine months, while a woman can have only one pregnancy.

Edit - I do recognize that in many species (humans included) females are more likely to reproduce than males. Given that the sorts of males who found companies are probably relatively high-status individuals, though, I would suggest that the likelihood of either being able to reproduce is pretty decent, and relates to choice rather than mate availability.