If there older than 2 years, & they dont have a buldge; there female. males start too show & are usually sexually mature after about 6 months & females are sexually mature after a year. so chances are you have 2 females !
I agree with AAGECKO's response and after 2 years, you would definately know sex. 2 females is a good thing, even though it is not a breeding pair because they can live together (if they are of comparable size) and if you get a male for them, you willl have formed a group which = more breeders. Personally, as a collector, I only breed for my collection, and if the geckos do not "fit" or if I do not really have room, thats when I sell them. Thats what I do. I love all geckos, but DON't be in a hurry to breed until you are ready for lots o babies. Just love your 2 females for what they are. Pictures please??