i would agree w/iris,
i would have a guess at it being a female. as the tail does seem to taper straight away from the vent. When i got my snake sexed, the man shoowed me a female snake and my snake and put them together and you could tell a definate difference between them.
But dnt take my word for it as i am not at all experienced in guessing the sexes of corns!! :S
KRIS