Actually there was one piece of misinformation in there, the chances of becoming male or female sex at birth is more of a 49/51 split rather than 50/50. That said it isn't that big of a difference for that to be removed though.
See, THAT makes sense from a biological standpoint. --- GGXRD: Leo, Johnny (Revelator); Skullgirls: Beowulf/Peacock