Female or male?

Sand boa i'm interested in adopting, do you think it's a boy or girl? this is the only picture i have of it.

http://i57.tinypic.com/2ykxras.jpg

its also a year old

If the vent (anus) is very close to the tail tip, it's probably a female, if it is farther away from the tail tip, probably a male. See this video.