the problem with sand boas is that the yonger they are the more they look similiar. from the pics i will stick with male. my females have always had really stubby tails from vent to tip. males are always longer from vent to tail but not always super long. some are VERY noticeably male others have to ponder a little. try and take a photo of your snake from vent to tip in your hand for size comparison. better pics would definetly help.
adam jeffery