I am guessing you mean you have di/di twins...2 sacs 2 placentas? That is what I have and am having 2 boys however there are ladies on here that also are having di/di twins and they are b/g. Not sure if anyone recommended it to you yet or not but get Dr. Luke's book When you are expecting twins, trip, or quads. it is a great reference tool.
Re: Seperate sacs...same or opposite sex?
Could be either.. I believe you have a 50% chance of one of each, and a 25% chance of both girls, 25% chance of both boys.
We have one of each