Hi iByU, I moved your question to this forum until we determine just what type of tortoise you have. Why do you call them Russian Desert tortoises? A picture would help in Identifying them. Some of the top of their shell, and of the undersides of them so that we can see their tails would help determine their sex. How large are they? Where are you located (state)? How long have you had them?
Oh and welcome to the forum.